As long as the money is fine which you state wasn’t an issue at any of the schools then it has to be the right fit for your daughter. It may baffle you and it may bother you but now you must support that decision. I had a friend and his parents told him he could go anywhere and money wasn’t an issue. He applied and got into Harvard. He also got in Rice full ride. His parents then told him he had to go to Rice. He argued and lost. He went to Rice and they bought a car for themselves. He saw what happened there. Today he is married with children and lives on the opposite coast from his parents. He had zero contact and they don’t know why. The relationship became strained over the college experience.
If she sees the school as the right fit for her and financially it is the right fit for the family then with her rejoice. If you are interested it is fine to ask her what is special to her about the university she has chosen. Ask out of interest and not judgment for your own knowledge about your daughter.