Best friend needs help

Idk what to do.

My best friend moved to GA 2 years ago with some guy that is now her fiance...

I have been seeing updates about her and she is getting skinnier everytime . Her face is sinking in, her arms look like bones, and I knew she had an eating disorder since high school but now that shes away from home there is no one to stop her

And to make things worse, her boyfriend is abusing her but she wont leave. She just texted to tell me he got arrested for beating her and I am so heart broken. She was supposed to come back to FL but shes staying to wait for him!!?

I get it people need to leave on their own but my best friend is in such a dark place I want to save her!!!! Idk how tho because when I take her in she just leaves. I want her to be happy again and safe 💔😭