SHe could be. My twins had 4 teeth by then.
When she tried to nibble, unlatch her. Don't let her develop this as a habit. you can then give her a chewie toy or nurse her more (making sure that she opens wide and latches good).
Kids go through different stages of nursing and I have found that every few months they decide to try a different technique. Sometimes that technique is painful for mom and sometimes it isn't (sometimes it is the "can I nurse and turn my head all the way. . can I nurse upside down, etc.") If it hurts, it is OK to say, "No, that one doesn't work for me."
Courtney wife to and mom to 4 boys: . I need !They're not typos. . . I can't spell!