I think it depends on the college, no? I mean NYU might prefer 4 yrs of math, but SCAD probably doesn’t care as much.
You can look at the Common Data Set for the schools she is considering. Most colleges do like to see 4 years of math, but if it’s math vs film and she’s applying directly into a film school with a portfolio/clips then maybe not?
I don’t know much about film but you might reach out to the admissions folks at the schools you are considering and ask them. The folks we have spoken with in admissions at different schools have been really helpful about high school course selection.