My baby needs to be put down

She was doing perfectly fine until she started getting sick, we don’t know what’s wrong with her because everywhere is asking for 800$ and we don’t have that much money to spend. I ask to nicely for donations to help me. My kitty lost feeling in all her body she won’t drink or eat anymore she only moves her head. I hate seeing her suffer she helped me mentally from when I got adopted so anything would help please and thank you!❤️❤️