Her reading score maybe because she is reading too quickly to get all of the details as required by the test. Or maybe she does what my girls do - they don't actually pay attention to all the details on the reading questions because they think they know what it says after reading only half the question. (They read a couple of words and finish it off in their heads the way they think it should go.)
I would have her read something and then answer some questions about ti and see what happens. You could either download something off the web or use a portion of a book you have and you make up the questions and write them down yourself. Don't ask the questions aloud because you want to see if she is reading them completely before trying to answer them. It is a fairly common problem with good readers.
