What does your DD say-- to you, privately-- about her behavior?
Is she empathetic towards her classmates (who are in the line of fire, so to speak)?
It really does seem like homeschool might be the only viable solution at this point-- and probably less negative than pulling her OUT to do so after she 'fails' to adapt to the placement options available. At least if you preempt the decision, it's nominally an adult decision, and not one that she's forced in a power struggle that most people don't even see that they're having with her.
