She will be taking AB calc as a sophomore - regardless she will be way ahead of most (even BS, despite what this forum makes you believe).
I told my kid (who is about to apply to college, I really should not be picking up the phone anymore) to either stop complaining about the teacher (who is horrible-but it is a personality issue) and ding on her GPA or to do something about it.
FINALLY scheduled a meeting with the advisor and maturely did not whine about the teacher but asked “this is not working out, how can I go about it”. First suggestion was Math Center (it is unclear if it’s happening. Writing center just reopened) - this is basically “open extra help” hosted several nights a week (on a regular year) by rotating faculty. It is a chance to get help from someone else, which sometimes can be very helpful. The other was to reach out to other teachers that teach the same class and ask to meet with them. I wasn’t sure this would be allowed but there is the full support of the advisor.