Update
Thank you everyone from the bottom of my heart for your prayers and advice, and for sharing personal experiences. You don't know how much it means to me and helpful it felt to know that others have been through this and have emerged from it.
An update: my daughter has been released from the hospital, although they did not feel that she was ready. She insisted that if they did not discharge her then she was just going to leave anyway. A pow wow of the doctor, nurses, therapists, and family members convened and it was agreed that the best thing for her would be to go home with my parents (another state) for her rehab and recuperation. Unfortunately she feels differently and it would have taken handcuffs and kidnapping to make it happen. Where in the world did this girl get her stubborness??
So she is back at home with the boyfriend and refuses to believe that things aren't perfect. She experienced extreme mental confusion while hospitalized, but seems to be 1000x better now that she's in the home environment. She insists that she'll do her therapy as ordered by the dr. It seems impossible and extraordinary that she is so "normal" after a head injury that no one expected her to pull out of.
The police detective says that my daughter is claiming she must have "fallen" out of the vehicle by herself and that the case is closed. They aren't going to try to do an investigation because they say they have nothing to go on but my "suspicion". Despite an assault charge my daughter pressed late last year that has yet to come to trial.
Family violence/domestic abuse agencies would not visit with my daughter in the hospital. One told me that she would have to contact them herself after coming to her senses and realizing that she is in a dangerous relationship. Then they would have someone meet with her to bring her to the shelter. They don't provide outreach volunteers to visit with injured women to discuss signs of abusive relationships, and the ways to prepare to leave them safely. Can you believe that? I was absolutely floored and just bawled my eyes out in frustration after talking to them.
So I'm back at home now and catching up on work. Letting my knuckles heal from pounding on the walls the past few weeks. Fighting the urge to drive back to Dallas to kidnap her and take her to a foreign country. Coming to the realization that she's an adult and I can only bear the pain of watching her mistakes and being here to help when they catch up to her.
Thank you again everyone. No doubt her miraculous recovery is due in no small part to the prayers said on her behalf.