I have worked with many graduates from U.Mass (mostly computer science majors, a few math majors). I have had a couple of doctors who were U.Mass graduates. All of the above have made U.Mass Amherst look very good (of course the doctors went to U.Mass Worcester for the last four of their eight years).
It does have a reputation as a party school. However, there are clearly quite a few very good and very serious students there.
Massachusetts has a lot of strong high school students. Many are the children of graduates of some of the well known top universities in MA. As the cost of university keeps going up, the number of these strong students who attend U.Mass Amherst rather than an expensive private school gradually increases.
I think that your daughter could find her crowd there.