I am really glad you have the help of law enforcement and the center for missing and exploited children. I am also glad that they are doing all they can to get rid of this sick vile man. You are truly in a catch 22 with your daughter, being home with no supervision during the day... .it does open the door to opportunity for her. I am glad that she does abide by the curfew rules, and does come home at night. At least you have that.
Does your daughter open up and talk to you? Does she share her thoughts and feelings with you? I am asking, because that could be an opportunity for you to sneak in and help her find her way back to what she should be doing. My DD was never very open when she was young, and it was very difficult to gage her thought process. I am in a better place with her now, so I can sort of see where her mind is going and can usually turn it around before she is too far gone on the wrong path.( not always though ).
Try just listening and being impartial when she does talk to you. I found that if I was aloof and just really displayed no emotion or gave no idea as to what I thought about her behavior, she eventually came to her senses. still today, she will ask me about something that I should have a very strong opinion about, but I just say things like, I don't know, I haven't really thought about it much. Or , I haven't ever really been in that situation, so I'm really not sure how I would react, or what I would do. When she pushes by saying , well what do you THINK you would do. I say something like, well, I'm certainly not you, but hypothetically I think I would... .I always end it by telling her she has to make her own decisions, and she has to live with the result of that decision. I remind her that she knows the difference between right and wrong, and she also knows she has to take responsibility for herself. I remind her again that we are not the same person, so the situation is hers to deal with.
Sometimes it actually works out the right way, but when it doesn't and she wants to be mad at me about it, I remind her of the conversation and that I made sure she understood the choice was hers not mine, and that consequences would also be hers and not mine.
I pray that everything works out for you and your daughter. Best of luck, take care.