This is something to be expected. While many snakes are more reluctant to bite hands, we can't assume that all won't. Your snake is in a feeding response, she doesn't care what's in front of her.

It has nothing to do with her being a sweetie or being gentle. She doesn't bite you while being handled for one reason. She has no motivation to. She's not doing anything wrong. Just expects food. If she is one of those snakes who is not cautious during feeding, just be alert around her.