Schools vary in how they treat AP exam results. Even within a college, it can vary by department and major. You can look up this info on each school if your daughter is serious about graduating in less than 4 years or using the credit for other purposes, she needs to make sure this is even possible at the colleges on her list.
Possibilities with AP credits:
Graduating early
Taking year off traveling, working and still out in 3 paying years
Getting out of taking certain courses student doesn’t want to take
Able to start at more advanced level in field of interest
More leeway in course load and withdrawing from courses
In my experience, most kids going to the selective colleges where students tend to bond with each other and with the school community, it’s rare that kids graduate early.They really prefer to take every bit of the 4 years