Should be washed at least 2-3 times a week, particularly if you have greasy hair like her, using a sulphate free shampoo. Bet her hair absolutely stinks. She isn't too hot on changing the bedding either so her pillow and pillow case must reek.Someone correct me if I'm wrong but I always thought that not washing your hair enough can be just as damaging as washing it too often. Something to do with the hair follicles getting blocked with dirt and oil and therefore not allowing hair to grow as well as it would if the scalp was kept cleaner.