My dd7 is also very visual. I asked her last night whether she liked pictures in her chapter books, she said she liked it a lot. She said she always had to imagine herself being in the story, being one of the characters saying such and such as in the story, so pictures help her imagine what things should look like easier.
I am also prob very visual myself since I really like books with beautiful pictures and have tried to choose those for dd when possible. Classics are easy to find with the beautifully illustrated version.
How does your dd do with early chapter books that have some pictures? Magic Tree House level still has pictures. Beyond that level my dd enjoys the great illustrated classic books, which I'm not crazy about because they are not beautiful pictures, but at least pictures every page and they made dd feel less intimidated.
Warriors series is also good for her to try since she already likes the graphic novel version. They have a book called "Cats of the Clans" that shows pictures of all characters in the series. It might help for her to see all the cats when reading the chapter book version.
If all these don't seem to work now, I'd say let her enjoy picture books with beautiful pictures as much as she wants. Many of them are pretty high in reading level and often have great vocabulary.
hth,
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dd5