Beautiful cat needs to be rehomed

I am trying to do right by this cat because I just can't keep her any longer. She's about 2 years old and showed up as a stray in my yard last year. Some weeks later she has kittens. I took care of them and got them homes. The day the last kitten left, I took mama here to SOCKS for them to have her and get her fixed and all, but they were full. So I took her home again. Didn't matter, she was already pregnant again. So I raised another litter and am finding homes for them too. She's a good cat, but I just can't keep her. Twenty dollars covers her, and a sample of her food, and her shot records.