My DD loves Beatrix Potter as well. Maybe you can download them as an audiobook? I know we have seen some of the tales narrated on Youtube.
DD also adores language. She was the same with Shrek by William Stieg with words like churlish knave, smote, and blithe. It is a very good book that I ended up downloading for her to listen to over and over and over.
The Mercy Watson series also has a lot of great vocab.
And, our very favorites, a few novels written by William Stieg (same as above) are filled with rich vocabulary-- Abel's Island, Dominic, and The Real Thief. We have read a couple of these twice. They are much more complex, so you might have to wait. I think they are at about a 4th or 5th grade level, so a bit beyond Charlotte's Web or Charlie and the Chocolate Factory.
