She sounds delightful and I love when they get so involved into a big project like that!
I agree that you need to look into it further to see if there are any helpful tips and tools that can easily be implemented.
I also agree that you should scribe as she needs you to for her book.
You may want to check out the work by another highly gifted child author who started writing at the age of 5 or 6. There is even a lovely video on her website on how to write a book - aimed at aspiring child authors.
http://www.evaridenhour.com/
