Going halves?

I locked myself out of my apartment and had to pay a locksmith $100 to get back in. The reason I locked myself out was because I gave my friend my keys to get into my place while I was out (coz she was moving in). We both left my place and forgot about the key she left on the bench. I feel like she should pay me her half (the $50) coz I guess it was both our faults. But she doesn't think she should pay. I just need some ideas on what to do or numbers on who thinks she should go halves with me. Thanks in advance! 🙏

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