C.S.
Talk to your pediatrician. If he/she won't address the issue or take it seriously, seek out a pediatric psychiatrist. It is possible that she has trichotillamania (hair pulling). My daughter (now 12) has had it since 1st grade and she pulls her eyelashes, eyebrows and her hair. She finds it comforting. Trich is very hard to treat (if this is what she has). Some psychiatrists believe it is related to OCD (obsesssive-compulsive dissorder), some think it's not. Good luck.