This is the adult daughter's view of the situation. Why might it not just as fairly be said she quit talking to them?
As for the parents' refusing to pay for her education when she has made it clear to them she intends to use that education to become a liberal activist to undercut her parents' values and beliefs, I would say the parents are making a rational and fully justifiable decision.
I have no issue with paying her way. It's the removal the familial support that troubles me.