Re the math, honestly, I'd not let them take her out of science and social studies with her class - even if it means you ultimately are having to give up her favorite math teacher or as rapid acceleration.
I agree with polarbear on this. It makes more sense to afterschool your daughter in her favorite subject (math) with more advanced, varied and fun curriculum compared to what the school district can provide, at her own pace. Since she is so interested in math, it might be easier to do it as well as go even faster than the pace set by the school. You might even outsource it to a tutor if /when she reaches a stage where it is hard to cope with her abilities.
And it makes less sense to me to afterschool her in 2 subjects (science, soc studies) with 2 parents involved in it to shore up grades.
Why not give up on the subject acceleration at school and do it on your own? And then consider the subject acceleration during Middle school?
Best wishes.
