You responded too late for me as I had already dealt with it, and not by just walking away. Yes she is almost "legal" as in agae, and yes she is able to whatever she wants and yes I do need to look after myself and my family.
Instead...I picked her up from school with the thoughts I was going to take her to the hos[ital, she came reluctantly, instead, I laid out rules, as I still pay all of her bills and grad is coming up I have this ability. As someone with a mental disorder I know that sometimes you have to push a little harder, so I did.
We are now at this spot: I do a body check on her morning and night, through her hair to in between her toes and under her nails. Any new injury, cut, bruise, bump and I immediately take her to the hospital and she can spend some time in the psych ward. She is not permitted to sleep at anyone's home until she gets help. I am taking her into deep meditation therapy while we find a psychologist, and I am feeding her meds to her daily and do a mouth check that they are gone.
She was schocked at the coldness of my rules (and yes there are more) and my behaviour, it truly scared her that I went void of emotion. She broke and opened up a little, so did I with point blank honesty and then after us my husband came into the room and she had to remain in eye contact with him as he explained where he was at, and then her older sister....She said she wants help. She said she is willing to work under all the rules. So, I check her, I rub oil on her injuries and keep her talking about them, I put her to sleep at night after her little sister, and I am now jailer.
3 days into it and it is a good start.
So, I don't beleive in walking away especially since she has been suffering in silence AND is not a mouthy, aggressive abusive child. She is a scred child and age does NOT make an adult.
Thank you for your input, I guess you didn't have enough information to give a better response, then she is 18 and can make decisions on her own (apparently she can't which is why she has Major Depressive Disorder).