D.C.
M.-
My husband has always struggled with dandruff. He has been using Nioxin Cleanser, available at Wal-Mart, and it has improved his scalp noticeably.
For greasy hair, try cleaning her pillow case more frequently, washing it every 3 days or so. There will be less oil transfer onto the pillow case, meaning less transfer back into the hair.
Good Luck.
D. C.