Haven’t read the entire thread. We’ve had friends who are upset with their kids choices. It’s often a case of parents who didn’t attend college or who went to a good college but want "only the best " for their kids ( whatever that means). Prestige can be difficult for parents and kids to address. For every kid who wants to be in a school that challenges them there is another who just wants to wear the sweatshirt. If you actually saw the other two schools as a better fit, well, then that’s very different. You could discuss why she chose that school.
Sounds like your daughter made her best decision and that’s great. I’m sure there are valid reasons she chose Auburn. Do you know what they are?