My name is Piper!

I adopted Piper from the SPCA. She was the longest one there out of all the other cats because she was aggressive, but once I  brought her back to my home, she came to love me and become affectionate, which is crazy because when I saw her in the SPCA, she was so nasty to everyone, but she warmed up to me and warmed up to my dad and brother. However,she has started to pee in places other than the litterbox. I have taken her to the vet and the only thing they could offer was possibly stress over the loud train noises as we live close to a train. We’ve tried everything we can think of and spent a good amount of testing but sadly I just can’t afford more and I can’t move and I’ve found myself confining her to smaller areas and I feel sad about that. I was hoping someone with the ability to spend the time and money to figure out why she’s continuing this behavior would be able to offer her a better home. I don’t want see her go to an spca again. The vet also told me it’s likely she has UTI