You already got great responses that addressed important considerations. I will add one more - MAP is multiple choice and untimed plus bright kids are good guessers. Class work can be far more challenging, particularly from an output perspective. I would make sure that your DD's writing and executive function skills are up to par (preferably superior) compared to her co-horts. If you can show that her work products are noticeably superior to her classmates, that may gain you more traction in a quest for acceleration/differentiation.
