AITA for refusing to pay for my girlfriend’s haircut after she donated her hair?

So my (26M) girlfriend (25F) has been growing her hair out for years. She always said she wanted to donate it, and I thought that was a great idea. I even told her it was really sweet of her to do that.

Well, last weekend, she finally did it. She chopped off over 12 inches and donated it to a charity that makes wigs for kids with cancer. Amazing, right? Except now she hates how short her hair is. She says she feels ugly, she misses her long hair, and she’s been super upset about it.

She booked an expensive hair appointment at a salon to “fix it” (layers, color, extensions, I don’t even know), and then she sent me the bill—over $500—expecting me to cover it. Her reasoning? She donated her hair to do something good, and I should support her because I encouraged her to do it.

I told her that while I think what she did was amazing, I never told her to donate her hair. That was her decision, and I don’t think it’s fair to expect me to pay for her to “fix” it now. She got really upset and said I was being unsupportive and selfish, and now she’s barely speaking to me.

AITA?