My girlfriend reads too fast

I am dead serious and I am here looking for many suggestions to give her. I did not really believe her at first hopefully I can give you a little sense. I got her Onyx Storm for Christmas and she really enjoyed it, for about a weekend until she finished it. Then, I told her about Hitchhiker's Guide to the Galaxy. She just finished the 5 book collection in a week while working her full-time job.

She has read a lot of James Patterson, John Grisham, Lee Childs, and David Baldacci. She loves fantasy and action, but mostly just loves books with good plots. She is not too interested in world-building, mostly just a good story without too many explicit scenes. I would love any and all suggestions as she has exhausted most of the aforementioned authors and many other books.

EDIT: Yes, she uses the library and e-books. She appreciates when I do a little research on these so I appreciate all the current suggestions!

EDIT 2: Thank you for all the suggestions! I collated a list of many of these suggestions then got ChatGPT to do a short summary of each and gave her a 7 page list of suggestions. She said this will last her a long time...hopefully.