What should I do about my 24 year old daughter?:?

She has been living on her own for several years now. I have been proud of her. She lived with me twice after my wife left. She has lived with her mom a few times, and one with her sisters. She mis-spends her money ($200 phone bill/mo., trip to Seattle to see her brother using all her tax return). I try to coach/advise her, but she rejects it. Last night she told me and her sisters that she has resigned from her 2 jobs because of PTSD. She has been in very abusive relationships with men. Most recently she drank with a man in a bar till late, and was "Rupeed" and woke up in his bed. She now fears she has AIDS...(she says she is getting medical care and testing). I drove to her apt in an other town late last night to get her (she lives on the same block as her mom and her boy-friend). She said nothing to me the whole way. She is sleeping on my couch now. What do I do? I have driven her to jobs as early as 5:30 am, fed her, clothed her, advised her best I know how. For her birthday last week she turned me down all day saying she was too "tired." I got to take her to dinner and give her gifts the next day, only to find out she sat in a bar with her mom for 5 hours on her b-day. More than I can put here, she is making terrible life-choices. And now it looks like she is setting her self up for either $$$ hand-outs or moving in with someone (possibly me). Her sisters and brother-in-law called me last night telling me I had to go get her...I was in bed. Her mom was drunk somewhere in a bar. They have all excluded her repeatedly. I have helped her to get counselling - we all have. She misses appointments for them as well as for free medical care she is elligible for and then looses the coverage. I am still working on myself - the divorce crushed me. My wife has been with a dozen men, and lives with an ex-con drug-dealer who is out of work and has no driver's license and beats her. I have not been with anyone since she left in 2008... I am just now getting stronger and moving on in a healthier way. I know I can help my daughter - what do you think is the best way?