Should I put my cat up for adoption?

I have two male cats which are 2 years old now, however, two months ago I decided I would adopt a kitten as a playmate since one of my male cats is really playful and his brother isn’t. I didn’t think it would be hard to keep up with the cost of three cats, However i’m now flea infested. i’ve tried everything and it works but I’ve notice that cricket, the kitten keeps getting them. she is allergic to most flea collars and unfortunately, I’m going so broke with her. I love her but I don’t think I can financially support her anymore, I feel like a horrible person and I don’t know what to do anymore. she is only six months, so I know that someone would be willing to take her since she’s so young. Should I put her up in adoption?