DD8 does this, too. She has had her teachers completely buffaloed for years. She gets top scores in silent reading, too.

I need to warn her teachers next year. I have also insisted on her reading out loud to me, which she enjoys.
DD8 hates to read, too. I have tried everything I can think of, and it all works for a little while, and then stops working and I have to think of something else.
We recently tried having her read into the computer. She gets pretty animated while doing it, and likes to watch the video she made of herself.
I have been bribing / threatening her. Before camp she had to have 3 books read or she wasn't going to camp. She read them. Before vacation she has to finish two more. She has one to go before Friday.
I also allow her to read easy books to help build her fluency and comprehension, but mostly to help build her confidence. She is more willing to try harder books, but it's in baby steps.
Finally, I think she gets distracted easily when she reads. She is really thinking about the story, and goes off on tangents while she is reading - which is good, but makes it take soooo long, so I have told her we can talk about it at the end of each chapter. She wiggles around a lot, changing positions while she is reading, which takes her eyes off the page. Then it takes a while for her to find out where she was. She also tends to jump ahead in sentences and on the pages, so I have started having her use her finger or a bookmark to track what she is reading. She especially needs tracking help when she has been reading for more than 30 minutes.
I actually think she has made some progress this summer, and I will be on her teachers again this year to keep their eye on her.