When entering her as your dependent, did your enter that she lived with you for the whole year. Did you enter that she was a full time student. Did you enter that you provided over one-half of her support (or did you indicate that she did NOT provide over one-half of her own support). Did you NOT check the box "not valid of employment" in the Social Security number section.
If all answers are correct, delete her as a dependent and re-enter.
