This little idiot has been allowed to ingest more of the "elite" treatment than she can digest. Only a long stay n a school with mature Christian servants might help her. But it would ne touch and go concernong her future. Even that might not work.
She needs an ego-shattering mind-altering experience to blast out a diamond-hard uncompliant selfish will. Put her to work on a farm with no other job than to clean out the cow-drop until her 21st birthday, no more schooling. Give her John Bunyan's "Pilgrim's Progress" to read, nothing else byt the King James Bible, Clearly she doesn't understand that either.
Separate her far from her biological parents. Neither one of them has demonstrated any kind of mindset, force of character, or commitment to her to be trusted with guiding her development.
Same for many other juveniles of her ilk. Break their will, not their spirit.
She ought to be in foster care.