Same as Paragons book.
Even before she got her powers, Panacea was a skilled doctor. She graduated top in her class at med school and got offers to work at hospitals all over the U.S. She chose to work at a hospital in Harlem. It was a dangerous neighborhood, but she felt like she could make a difference. One night, the E.R she was helping out in got used as a place for some drug dealers on the run to hide. Nothing happened to her because the cops got in and talked the dealers down, but Panacea was changed forever.
The first public breakout hadn't occurred yet, so she kept her powers secret. Patients who looked on the verge of death managed to recover, broken legs turned out to be nothing more than a sprain, and people who came in for second opinions on fatal diseases ended up not having the disease. It was all explained away using some medical explanation. Patients loved her and the hospital administrators were glad to be on the map.
Like the rest of the world changed after the first public breakout, so did Panaceas life. Her diagnoses were questioned when they constantly conflicted with other prestigious doctors. A hospital administrator who failed to seduce her accused her of being a paragon like the criminals portrayed in the media. It pained her, but Panacea had to stop helping people. Finally, her secret was revealed when she used her powers to heal a fatally wounded man. She was ostracized and had her medical license revoked.
Taking Unity up on it's offer, she moved to Unity as the town doctor. After the attack by Akira, she joined with Calamity Jane, a paragon she had saved, to start an underground railroad for paragons to escape registration.
Panacea really cares. Maybe a little too much. She will put her life in danger just to save one person. Frequently, she needs to be dragged away from a burning car before it explodes or any other situation. using her powers so often is taxing on her, but she does it because deep down she wants to make the world a better place.