On August 20, 2018, Valentin Cassadine visits Madeline Reeves in Pentonville Penitentiary. He questions her about the story that her daughter Nina lost her baby while in a coma. Valentin studied Nina’s medical records and noticed an eight month window where she was not at Crichton-Clark Clinic. He asks Madeline if Nina had a son. After he doesn’t get the reaction he wants, he asks if it was a daughter and realizes it was. Madeline finally admits that Valentin figured it out.
She explains that she got the dosage wrong when she drugged Nina to kill her baby back in the 90s. Nina went under but the baby held on. She couldn’t try to drug Nina again or suspicion would fall on her instead of Nina’s ex-husband Silas Clay.
Madeline said she hired a discreet nurse (later revealed to be Phyllis) who looked after Nina until she delivered. Then Nina was transferred back to Crichton-Clark.
Madeline reveals that she put the baby up for adoption anonymously. That way they couldn’t identify each other in court. She says she still has a way to track down Nina’s daughter but Valentin argues with her and says that he hopes she rots in jail before angrily leaving.
On August 28, Nina received a call from Pentonville informing her that Madeline was dead.
On September 7, Nina received a package from her late mother's lawyers and it contained a locket she loved as a little girl. But half of it was missing (Madeline also wrote in a letter that the locket could mend a broken heart) so Nina deduced that her child must be alive and they have the other half.
The same day, Jordan and Curtis Ashford visit Carter Buckley, the lawyer who brokered the illegal adoption of Nina’s child. He didn’t have much information except to say that Madeline had the child sent away. Curtis concluded that Madeline must have hired a private nurse (Phyllis) and a doctor who delivered Nina’s baby.
On September 14, Nina asks a jeweler named Ahmad about the half heart necklace. He confirms that it looks like it was divided from a full heart pendant but doesn’t come up with anything else.
On October 1, a DNA test confirms that a woman named Sasha Gilmore is Nina’s daughter with Silas. However, on November 2, it is revealed that Valentin hired her to pretend to be Nina's daughter.
On April 1, 2019, two more DNA tests confirmed that Sasha is not Nina’s daughter with Silas.
On April 9, 2020, it's revealed that Nelle Benson-Jerome is Nina’s daughter with Silas and Nina also has a grandson named Wiley Quartermaine-Corinthos. Nelle is seen with a half heart necklace in her jewelry box. She is also shown in a flashback as a little girl wearing the necklace when she lived with her adoptive father Frank Benson.
On August 12, Nina tells her boyfriend Jax about the necklace and he calls someone who may be able to find out more about it. Nina and Jax later meet with Jax's jeweler, Evelyn, who tells Nina that she might be able to find the original craftsman.
In August, Nelle returns to the Corinthos Cabin with Wiley to hide out. Michael finds her at the cabin and rescues his son who was kidnapped by Nelle. Nelle runs away and Carly confronts her but Nelle ends up falling off a cliff. Her body is not found but her half heart necklace is on the ground. A police officer looks around the area that Nelle fell and doesn’t see the necklace. Later Nelle’s body is found on the Pennsylvania side of the river and it is concluded that she drowned.
Evelyn returns on September 1 and informs Nina that the necklace’s clasp has an interwoven set of initials on it. She traced the hallmark to an artisan in Manhattan.
On September 10, Nina and Jax go to Manhattan to meet the jeweler. Nina says he hasn’t returned any of her calls. She wants to back out since the jeweler is retired and she doesn’t want bad news but Jax convinces her to knock on the door.
Jax asks if the man who answers is a jeweler named Abraham Dobkin and the man says he is. Nina shows the necklace and says it was divided. Abraham mentions that he usually makes full hearts but that request sounds very familiar.
He remembers the lady who asked for the necklace to be divided. Nina shows a picture of Madeline and asks if it is her. Abraham says he has never seen her before. He does keep receipts and finds one from September 1991 for a woman named Phyllis Caulfield. Jax asks Nina if she recognizes the name and she says she does.
Nina later reveals that she remembers Phyllis as the nurse who took care of her after she came out of her coma at Crichton-Clark. Nina assumes Phyllis must have helped Nina give birth. Nina tells Jax they need to find Phyllis but she puts the search on hold for now.
In September 2020, Ava convinces Sonny to let her have Avery Jerome-Corinthos but she has to agree to stay at the cabin. Once there, Ava hits an intruder on the head with a fire poker and he turns out to be her husband Nikolas. They argue briefly before making love in the cabin.
In the meantime, Avery wanders in the woods and finds the necklace which she takes with her. After Avery is found, she later shows the necklace to Sonny.
On October 19, Valentin offers to help Nina search for Phyllis. Nina refuses his request.
On October 23, Curtis accepts Nina’s previous offer to locate Phyllis.
On October 27, Curtis tells Nina that he narrowed his search down to six nurses who worked in the 90s with the name Phyllis Caulfield.
On November 12, Phyllis introduces herself to Jax. She says that Curtis contacted her as she was the last Phyllis on his list and he had almost given up. Nina recognizes Phyllis immediately and Phyllis confirms she was there when Nina gave birth. Nina asks if her baby is alive.
Phyllis tells Nina that she was one of four nurses when Nina gave birth. She wasn’t there at the time but Nina’s daughter is alive.
Phyllis explains that she was part of a private nurse staff hired by Madeline who were told not to let the baby’s father know about the child. Nina clarifies that her mother put her in a coma. Nina asks why Phyllis didn’t tell her about her daughter while Nina was a patient. Phyllis says that Nina was having a tough recovery after the long coma and Nina abruptly left the clinic.
Phyllis brought the child on a bus to North Florida to meet a couple. Madeline had agreed to split the heart necklace in two and one half was given to Nina’s daughter.
Carly notices Avery’s necklace and remembers that Nina showed Carly her half heart necklace before when Nina explained that her daughter had the other half. Carly realizes that Nelle is Nina’s daughter.
On January 14, 2021, Phyllis returns as a nurse working at the Nixon Falls Clinic Sonny is taken to by a hiker named Eddie. Phyllis talks with Sonny and thinks he might be a cook since he knows a lot about food. Sonny points out his wedding ring and says he might be married. Phyllis talks about a former patient who was in a coma for twenty years and now she is living in Port Charles. She notices his watch and he discovers the inscription is the name Mike. Phyllis thinks that must be his name.
Phyllis takes "Mike" to The Tan-O, a Pennsylvania bar her husband Lenny owns and tends bar. Lenny is initially reluctant but after "Mike" explains his situation, Lenny offers him a job as dishwasher. “Mike” notices a tattoo on Lenny’s arm and concludes he must have been a Marine. Lenny says he is correct. A man named Walter comes in and attempts to rob the place by pulling a gun on Lenny. After “Mike” stops the robbery, they give him a room and board, while he attempts to get his memory back.
On August 13, 2021, after sitting in front of The Tan-O and watching the sunset, Lenny dies from complications from pancreatic cancer.
After Sonny gets his memories back, Phyllis comes back to Port Charles with him and stays at the Metro Court. Sonny buys Charlie's Pub from Ava and makes Phyllis the manager. She moves into the office apartment in the pub.