Unfortunately her 18th birthday isn't until mid-August next year. She's 11 months away from making her own decisions, including just being able to stay alive. If the courts send her back to her parents in Ohio she will be dead within 24 hours by her family or a week if other fanatics get in touch with her.
The courts will charge a 17 year old as an adult, so in this case, 17 is old enough to speak for herself and make her own decisions. When someone has to live through the things she has had to live through it makes you grow up fast. Agreed?