Note: When comparing endowments, it makes sense to look at the figures per student. Chatham Hall has a small endowment, but its per student endowment is nothing to sneeze at.
Some schools advertise their financial aid budgets. If you can find those, along with the data I posted above, you can start comparing apples to apples. Again, size of the endowment doesn’t mean much. What the OP should be concerned with is how much they are spending on financial aid.