Part of that reaction to the final third is that it's a long film and she really doesn't like to watch movies. Overview: She liked the first third, really liked the middle third, but didn't really care for the final third. She felt like she should see it given how important it is in pop culture and, of course, because Halloween is near.
My friend, a 20 year old woman, had never seen it but was aware of the memes. I've seen The Shining many, many times over the years and while I really like it, it's not my favorite Kubrick film.