Just a short update, thank you everyone here trying to help. Wish all of you have a great day.
I've sent the cat to do the surgery and the vet thinks she probably would live. They give me a price which is not as high as I thought, but I've not seen the final bill now.
The lady from Adopt Meow gives me some useful information and recommends vet clinics. Thank you.
I am not a cat person~ at least since I was not able to help my own cat. I may try to find someone to adopt this kitten after she recovers, but she is a tortoiseshell cat which makes the adoption hard too. Please let me know if anyone wants a kitten. She is very sweet, I never see she bites or scratches anyone, even my noisy kids. I have to say she is sweeter than my own cat who loves slapping me.
I mean, it is hard to see something dying in front of you and you know you can help, but you just don't.