She should certainly retake it but you should also be looking at schools where that score isnt a super low score. There are plenty of schools where that math score is perfectly fine.
You must remember that the ssat is testing a huge range of kids, including kids who in 8th grade are taking pre-calculus. It’s hard to wrap your head around the level of math competence of some of the advanced kids when our own kids have always been the “smart ones” in school.