I wouldn't bite her back; that says it's okay to bite. I can't remember what we did when my kids did that but probably let them know it hurt and it's not okay. At 2, they don't know how to deal with anger.
_________________________
Well-behaved women rarely make history. - Laurel Thatcher Ulrich
http://ruthrainwater.wordpress.com/
http://newbeginningsgratitudejournal.wordpress.com/
http://sablewings.wordpress.com/