If she did bite you, it wouldn't be a big deal. Even an adult ball can't do much damage when they bite. You don't really mention how big/old your snake is, nor how long you have had it. From what information you provide, she is either stressed out and scared, or possibly still hungry if you are not feeding her enough.

You can help us to help you by providing some more information. How big/old is your ball ? How long have you had it ? Has this ever happened before ? What is her enclosure like? Does she have places to hide? What do you feed her and how often?

Gale