Thanks everyone for suggestions.
I don't know why she doesn't like them, as she always says that she does... I just inferred that she doesn't by her behavior i.e. not reading them on her own. It seems that quite often she prefers to do/read things that are significantly below her ability (it took her over a year to admit that she could read, only when she was around 1st/2nd grade level of reading did she admit to it and was able to read in front of someone other than me or my husband)... similar situation with other activities... she seems to not want to do something (or at least not in front of anyone [sometimes I can be the exception, thankfully]) unless she's 110% sure that she'll succeed :(
She likes the Magic School Bus series (we got some old books that are based on the TV series from my sister), and she was reading one by herself today... I also got her a MSB chapter book, and she was excited, but again, wasn't reading it on her own (though it was on her level)... maybe lack of pictures? or poor paper quality (compared to the "normal" book she's used to)...
I'm also having a hard time figuring out what she's interested in specifically... we generally read non-fiction books, and only now are starting with fiction... but I can probably count only a handful of times when she said that she didn't like something or wasn't interested in something... she does seem to prefer things that have to do with bodies/anatomy to those having to do with, say, animals/dinosaurs, and she prefers pirates to princesses ;)