Are you asking where she can find the books required for her classes? I didn’t go to UH law school, but at Baylor, I always got my books for each year at the book store on campus. She can try Amazon to get a better deal on used books, but finding the right version might be more difficult. One other option is to make quick friends with someone a year ahead of her and see if they still have their books for year 1 she could buy at a discount.
Things may have changed since I graduated from law school in 2005, but I wonder if renting is an option somewhere.