Both of my boys struggled with this. We found that using a template worked wonders. I did a quick search and found this site that has several very nice templates you can print for free. When your kiddo only has to fill in the blanks, you may find the resistance goes down.

http://www.thatresourcesite.com/book_resources_blank_book_reports.htm

~Lisa
http://www.lisaabeyta.wordpress.com/