Kitten being eaten by maggots?

There are stray kittens outside of my house and one is being eaten alive by maggots. I picked one of them up earlier today, and a maggot fell from it's . I looked under it's tail and maggots have eaten a hole and buried themselves into the kittens backside. It's a hole about the size of a dime and I don't know what to do. I tried removing them, but she's screaming in pain and I can't hold her down long enough. One of the kittens ped away today, and I couldn't understand why, and now that I think about it, I never looked to see if there were maggots anywhere. I feel so helpless. I want to try and save her before she dies like her sister did. I have no money to take her to the vet and I've been waiting for a no-kill animal shelter around here to open up to accept admissions. The only one around here will only take them from 2-5pm and it's past that time. I'm afraid if I wait until tomorrow, alot more damage will be done. I'm panicking so bad because I feel like it's no use in trying. I tried to remove the maggots, but it's almost impossible. The hole is full and I'm not sure how deep it goes. She doesn't seem to be slowed down too much by it, but she's definitely not herself. She's still eating and drinking and running around, she just looks sad and in pain. I'm going to try to take her to a cat shelter tomorrow, but I'm afraid they're going to eat through her so fast that tomorrow will be too late. I don't know what to do. :( Again, I don't have the money or transportation to take her to a vet right now.