Does the math sub score meet the college readiness standard which is a 22? If not, that could be an issue at an Ivy. If she takes the ACT again, she should focus on the math questions she knows she can get right or thinks she has a good chance of doing so. Since she’s not aiming for a super high math score, no use wasting time on questions she can’t figure out. Let those go and spend time on those she can get right. Use the time on those questions and spend no time on the really tough ones. Now that’s not a strategy for someone aiming for a math score in the 30’s, but your D probably not going to achieve that anyway. So insuring she gets correct the questions on topics she knows how to do, will raise that score.