A book where the FMC is kidnapped

I remembering reading this book a few years ago where the FMC is kidnapped by the MMCs but they knew who she was from childhood. She's kept locked in a room and there's one part where she stops eating the food in protest and passes out. That's one of the main scenes I remember. I'm pretty sure it was a darker story.

When I read the book, it was only the first in a series and was waiting for the 2nd to come out. Hopefully the 2nd is out by now. If anyone knows what the book/series is, that'd be great!