Fastpitch softball bat ignorance

My daughter will be at 13 next week and she plays travel softball 14 U. Right now she is swinging an older Easton ghost double barrel. She’s had a few of them, and she prefers the DB. It is a 31 inch drop 10 we also got the gray and yellow 2018 Easton ghost from her pitching coach it is a 32”. She’s tried swinging the 2018 several times at practice and she hates it. The 31 inch she’s been using has a small crack and we all know how that goes.

I went online and was going to order the new ghost OG for her and her dad is telling me to get a 32 because that’s probably what she’s gonna need soon, but she is begging to get a 31 as that’s what’s comfortable right now. I do not see the point in getting something brand new to replace her current cracked bat that she can’t use now. It’s all so confusing to me. I feel like we’re getting “new” used bats ALL the time. I have bought one brand new bc it was marked down from over stock and she ended up not using it long. So I dk if I should buy a brand new one again.

Make this bat craziness make sense please.