Good luck Maria -
I'm guessing that the 'Student Assistance Counselor' is in charge of 'social and emotional needs' - if so, get her to look at the teachers gradebook and tell you if she thinks that this is an emotionally healthy situation for you DD to be in - seriously!
As for your DD trying to go to 100% that can backfire in a major way. Let us know how the meeting goes with the principle, but I would work on the SA Counselor to co-write a letter to the principle letting her know all about this and DD's reaction and SAC's opinion.
Grins,
Grinity