If she’s in 10th now and you’re worried about the math grade in 12th, now is the time to work on these skills, get her ready to have options.
How big a deal? You dont know how her interests might evolve by senior year. Nor how competitive her final targets will be, for kids from your state. Schools like USC and UCLA may like the picture she offers, but pick kids to admit who have the stronger rounding. Liking an applicant is just step one. Then they balance.
In some respects, you don’t want to wait to cross that bridge when you come to it, only to find it burned out.