Captive turtle

I have a 2.5 year old yellow bellied slider female that I hatched. Our intention was to hatch her and release but once she hatched, it was December and it was waaay too cold so we decided to wait until the weather warmed. Then she was too small... we'll, she's still small but she'll be big enough to survive the fish next summer, but now I'm reading that it's dangerous to release them into the wild. What do I do??? What's done is done and it won't do any good for anyone to scold me so please don't. I have a 3/4 acre pending my backyard with turtles, geese, ducks, fish, crawdads and frogs. It it a death sentence to release her?