4 Month Old Campbell Dwarf suddenly bites me for unknown reasons.

[Shina]

As you all have read from the title I have no idea why she's biting me, I've always washed my hands and dried them before touching her, she was always calm and nibbles only a little to none when picked up but from last last week she had been biting me when I feed her or just put my hand in cage to let her hop on like I always do, I respect her choices when she doesn't want to get up, but that day, she bit me like I was food, no tugging just biting. This week she did tug my hand mostly whenever I put my hand near the cage door now. Is there something up that I need to know?