I am sorry that you have to go through this, it is sad and so uncalled for. I am not going to mention about committing her to a mental health treatment facility, since you said you have spent $75,000 on her and I am presuming treatment has not worked.
I am afraid at this point, you are really in a situation that you are going to have to make some tough decisions. First, the court will not generally emancipate her for this reason, so this really is not an option unless you can prove she has employment and can support herself.
Another option you need to look at going to court and filing a petition to have her declared ungovernable and the court can make her a ward of the state. If she is as violent as you say, this may not work either because the foster system will not help her much.
Finally, I am afraid that really the best solution for this type of situation is the hardest choice to make and that is you need to have her arrested when she acts this way and pursue the charges through the court without backing down and let them sentence her to jail because I am afraid a jail is the only place that can handle the type of violent behavior you are describing above. Someone with that type of violence will eventually seriously hurt or kill someone and you need to protect yourself and follow through with criminal charges when it happens again as now she is 16 they will charge her as an adult.
I am sorry to say that these are really your only legal options.
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