First, Jill isn't rich. Jill's parents are rich and I hope she has enough respect for her parents not to ask them to open their check books to every sob story she happens to come across.
Second, It was an ancestor of the Royce's who co-founded the college, most likely by giving a large endowment. The college is, most probably, a separate entity in itself and not the Royce or Burgmeister families.
Third, Jill's parents are, again most likely but we don't know for sure, not the entire Royce family and we don't know for sure just how rich they are, or how much influence they have over the college.