Fi needs jaw surgery

We are a small group of five people from St Petersburg helping cats in difficult situations. Unfortunately, we can't handle all the troubles, and fundraising for animals barely works in Russia, we have some people who sympathizing pets and our situation, but almost all the time we can count only on our own forces and money. Nowadays we take care of around 30 beautiful cats, both healthy and with different diseases, and all, abandoned. For today, one of our pets requires surgery. We are taking care of Fiona and two of her sisters since her owner had died from cancer. We already treated Fi from otitis, misfortunately she is also suffering from a tumor on her lower jaw, which was discovered on usual check-up and it grows rapidly, so we can't wait and the only possible help is a surgery. We are lucky we have a vet clinic who pity our situation and helps with qualified treatment and surgeries with some discounts. Analysis and echocardiogram cost around 4000 rubles (~63$) plus more than 10000 (>158$) for surgery and apr 4000 (~63$) for histology - we pray it's not cancer. So, in summary it's more than 18000 rubles (285$), to compare our usual routine for cats (food and tablets) per month cost us around 200$. If it is possible for you to help, we will be endlessly grateful, we have a lot of stories with a happy ending for real suffered animals, and we hope Fi's can be among these stories. We provide all analysis and x-rays and any other reports and checks, with medical prescripts.