If she doesn’t want stress in high school, please don’t send her off to a stressful college.
Truth is, even art majors are expected to have rigorous academic rounding for the more competitive colleges on her list. And even as an art major, some will expect this same sort of rounding in their curriculum requirements, once in college. Maybe you two need to look at the courses required, once there.
One of mine dropped out of AP calc, but back to honors level. It’s a calculated risk and one needs to be cautious. Does sound like she has good backup choices in FIT and NEU. But be aware, for the others.