I've raised £500 to help with emergency vet bill

Hi everybody,
My kitty Cassie needs help. I find her 1 year ago when she was 5 weeks old (we had a hard work). I never wanted her to go out.. We live near to big forest. Everyday I see posts on Facebook about cats who was shot, hit by car, killed by dog, humans.. One day I did go to work and I forget close the window. She did run away from our flat somehow and when I came back she wasn't there. I run out in a second and I was trying to find her. She was nowhere. I started screaming her name and after 2 minutes I heard her. She was lying in the grass, meowing. Her leg was full of blood. I didn't know what happened I had on my mind it was some dog. I run to the vet and he said she was shot by some gun using in forest on wild animals. Some hunter shot her without no reason. She was so scared, can't move, breathing like a dog, in pain.. When I looked into her eyes.. Oh god. I never felt bad like that.. It was my own fault that I didn't close the freaking window. The operation, tests and treatment are so expensive. So if some good soul can help, it can be 1 pound. Everything will help us. Thank you so much.