somw baby teeth early but i think it's more of the suction or force used by the baby. baby is growing day by day and the force or strength used will eventually be harder which is normal. if you do feel sore, you can apply some breastmilk before latching. alternatively, you can apply nipple cream after each feed.
If your bub is teething, her latch may be a little different as babies are feeling the new configuration in their mouth. Babies are constantly experimenting. Do bear with it for a while or adjust your nursing position to make the latch more bearable.