I seem to remember some kids who were autoadmits to UT NOT getting their first choice of majors this year, and I think maybe it was CS specifically. Here is a thread:
If her major is very important, then UT isn’t going to be her safety even with an autoadmit. GA Tech had kids with perfect scores in-state get rejected this year, too. You want to make sure she has a few school that are easier to get into that she’d be willing to attend on her list. Having just one true safety can be depressing to a kid if they happen to strike out on all their other admissions – having choices in the spring is good.
Other schools you might look more closely at to see if they match her specific CS interests are Case Western, Northeastern, or RPI.