This 100%. I was the daughter in this situation when I was 19...my ex bf wasn't as bad as this guy sounds, but I had met him in Brazil and decided to stay there with him and he was basically emotionally abusive and manipulative. My mom begged me to leave him and come, she tried everything she could to reason with me, she told me that she would literally lay down in the middle of the highway for me - and none of that worked. I had to come to my own realizations and it was really fucking hard, but my mom was there for me when I finally was ready to come clean and admit I had messed up big time. I have a feeling things will play out similarly for your daughter. Just be patient, talk to her as much as you can, and just make sure she knows you're always going to be there when she needs you. It's gotta be beyond hard to watch and I feel so bad for all the crap I put my mom through, but it's all worked out good in the end.