There is a pretty good chance that her coach knows she struggles with overthinking things and he is trying to help her by telling her her only problem is a dead bat. Having one problem that can be quickly remedied (new bat) just might clear her mind enough to have her start hitting well again and not worrying too much about working on a bunch of things. I've seen it work many times before, especially for girls who have hitting coaches that give them more than one thing to work on at a time.
Plus, it isn't his money.
Plus, it isn't his money.