Her associating your hand with food is an old wives tale and completely NOT true. That said, be sure not to handle her around feeding time.
She NEEDS a hide, prefferable two...one at the warm side and one at the cool side. Hides are EXTREMELY important.
Dirt will only make her dirty and it's not needed. She may ingest it when eating. Please try newspaper, repti-bark or aspen...never cedar or pine woodchips as they can kill your snake.
Hope this helps.