I am assuming she is a little scared of Montie, and if she is, Montie is picking up on that, they can read our emotions and act accordingly. Does she show hesitation on trying to come close to Montie, and if she tries to pick him up and he goes to bite her does she pull back? If she does he knows she is afraid and he knows he is in control, all he has to do is bite her and she goes away, he's running the show, so to speak.
She may need to back off for a while and try to work on not hesitating to follow thru when she goes to pick him up. When she does try to pick him up, she shouldn't pull back and if the bite comes then push into it, I know it will hurt but it may be the only way to get him to stop it. When he finds out that the bite is not going to make her go away he may stop biting her.