For me, other than bitting during a few of the teething months, the actual nursing with teeth hasn't been a problem (we are starting to wean at 27 months).
Consider positioning her slightly different so her mouth is angled a bit different so the teeth are not rubbing on you.
Encourage her to take in more of the areola, this will lead to a better latch with less rubbing.
If she is chewing or bitting on you instead of nursing, take her off and tell her "no bite".
To help prevent the bitting to begin with have her gum something cold or rub her gums with a wet cloth to help sooth them so she will not sooth them on you.
I have even used teething gel to numb my son's gums before nursing on the days he really wanted to chew.
Go to www.kellymom.com and www.llli.com (le leche league international) I am sure they have articles about how to nurse so the teeth don't rub.
Good luck, and nurse for as long as you feel up for it. The older they get the more fun it gets.
State Certified Early Childhood Special Education Teacher
New Mom as of March 2009!