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
I'm with Grinity here. She only needs to get one thing wrong one time to blow that plan out of the water.