Help biting ferret

Hello. I got this baby ferret (female) two months ago. She was nippy just like every other kit I've gotten. She seemed like she was learning for a while, but recently she has been bitting me and my boyfriend every time we pick her up. She's always seemed to be a little anxious but we always say her name when we are going to pick her up. Every time she bites us we scruff and tell her No Bite. It seems to work then two days later she does it again. We've tried the bitter apple stuff and she still bites. I don't know what else to try.