My oldest has been reading fluently since she was seven. She has read graphic novels (Warrior Cats), instruction manuals (Sims Pets, Pokemon), encyclopedia-type books (dogs, pokemon), she's read newspaper articles (dogs, again), maps (wall, road & bus), she knows how to find information via an index or google, read out loud to her sister (picture books) but she's never been interested in reading chapter books/novels.
As a slightly rabid bibliophile who started reading novels at seven, I admit it took me some time to get used to the idea of having a non-novel reading daughter. I knew she could read and I saw proof of it every day. I knew big, fat novels weren't the only way to enjoy a good story.
A few nights ago she picked up my Harry Potter book. I own all the books and movies. She's watched most of the first movie and parts of the others (the movies are too dark for her), so she's familiar with the story. Over the past couple of days she has read 75 pages of Harry Potter and another 30 or so from two other books.
Will she finish the books? Maybe. Am I invested in whether or not she finishes the books? Not at all. I know she can read and obtain any information she needs.