Question about Geillis

I never finished the show because the violence was too much for me, but I have watched many scenes of the later seasons. I haven’t read the books either.

So my question: Do they ever tell us how she lives?? Last clip I saw Claire was told they waited to execute her until after her baby was born and I know she comes back in the show so I’m just wondering how she survived.

Also, you really fall in love with her character when she sacrifices herself for Claire. Was the fan base horrified when they found out she’s a psycho murderer? Watching the later clips she’s like a different person.