Stunning reader getting bored of reading!

DD1 (also 7) is stuck in a similar rut with the Animal Ark books. But they are at least a bit more substantial than Horrid Henry, Rainbow Fairies etc, so each one takes her longer .

She does seem to like Jeremy Strong and has read all the Roald Dahl children's books, including the longer ones like Danny the Champion of the World, which gripped her and took a LOOOONG time to read.

Hi there,
I know it's a pain that she wants to re-read the same books over and over again but from an education perspective (I'm a primary teacher) its actually a really good thing for a whole variety of reasons - too many to mention.
Also as a kid I used to do the same thing ( drove my mum potty too!) but each time I re-read them I discovered a bit I'd missed or I was able to make the characters/situations more vivid or I could understand the characters motivation better. Even as an adult I still return to a few of my real favourites and re-read them from a fresh perspective.
If she's enjoying it and is still reading then what harm is she doing? If you're really concerned perhaps you could encourage her to chat with you about what she really enjoys about her favourites and then go to the library together and ask the librarian to recommend some in a similar style?