I think she doesn't really know what free expression means. It does not mean, "you can say what you want as long as we agree with it." That's certainly how I read "more importantly, they encouraged students to select courses on the basis of incomplete information". Free expression means that the administration cannot control the message; people can say what they want. This is OK; win in the marketplace of ideas ("maybe I should evaluate my courses with more contextual information"), not by treating your students as children who can't decide for themselves how to consume information.
Also, this bit about reconsidering whether to provide the data at all is childish. "You're not interpreting our data the way we want so now you can't have any! I'm taking my ball and going home!" It's worth remembering (both here and in the thus-far imprecise and confused discussion of who "owns" the data) that the students are the ones providing the evaluations being aggregated here; at the very least, it's unclear why they'd be expected to continue doing so without getting some quid pro quo benefit from it.
Stop trying to control everything and trust your students to be smart and thoughtful.