I read the OPs responses again.
The OP has made clear that her tuition will be covered by the GI Bill and help from grandparents. The main argument I’m hearing from everyone here is that UNCCH is a better school. It seems that her mom’s objection is the same. The issue doesn’t appear to be financial. However, OP, it’s in your best interest to clarify 100% that the price difference is not a problem.
OP wants to persuade her mother that she feels Auburn is the best choice for her. Shouldn’t we help OP try to find ways to do that, rather than try to convince OP that UNCCH is a better school?
OP, if your parents are ok paying the cost difference, stick to your main argument. You really want to be at Auburn. Your college opportunities are what you make of them, and you will probably do extremely well there academically, which will help give you an advantage. Auburn has a 92% freshman retention rate, so they much be doing something right. The endowment is comfortable. You can get all kinds of information about post grad outcomes by using the Auburn career center links. They have job fairs and internships just like all colleges. Auburn grads are clearly going on to post-graduate jobs. Give your mom some facts so that she doesn’t just think you only care about sports and vibe.
Good luck, and I hope you end up at Auburn.