she balls up? do you feed her in a separate tank?
I do, but my ball python has only ever balled up on me once in the 3 years I've had her.
If you're feeding her in a separate container maybe you should try leaving the prey in her tank, covering the sides, turning off the light, and waiting around a day. It has worked for others trying to coax a shy eater into a successful eating
She only balls up because I move her to a separate place to feed her. Once she's in the container, she relaxes and starts following the prey around. I do make sure its very dark, but I keep a close eye on it because I'm worried the live prey might hurt her.