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Before a decision to leave is made, consider family therapy, individual therapy for the daughter, psychological testing for starters, and get some help with this situation.
She didn't get here by herself; she didn't become what she is by herself; and she cannot "fix" herself by herself.
Please do not "throw her away" again. Accept the fact that it will take more than two years to the traditional age of emancipation, 18 years of age, for her to be successfully independent, but, in the years to come, with the right and consistent help for her and the family unit, she may be able to achieve her potential, whatever it is discovered to be.
And that is all any parent can hope for.