My girl got attacked by a pit bull need help

My pretty Mika was attacked by a big pit bull on Saturday, July 31. Don’t get me wrong, I am not accusing the breed, but their mouth is really strong. Mika spent the night at the vet clinic she has a tear in her bladder and a few big wounds for now. They has to Install a drain in her. 
The gentleman who own the pitti says he would help with the vet bills but that he can’t afford the amount they are asking right now. Let’s hope he pays the whole thing. 
I am devastated the vets all says Mika is such a good dog and soooo good even though she is in lots of pain right now. They gave her pain meds but she is still in lots of pain. The estimate that I just receive is $3000 I need help to support with the bills. I can’t lose my baby girl she is my everything and the only thing I have left.