I second what people have been saying about reading too fast. This may or may not ring true for you, but something that we have found with dd5 is that if she is reading to far below her reading level she she misses easy words and can't tell you what happened. If she reads something at or just below, she reads fluently and with good comprehension. It was causing issues at school because the teacher didn't think she could read as well as she can.
At first I was baffled by why this was happening and then I realised that she was probably no different to me - when I am reading a book to her that doesn't engage me I literally do not absorb a single word despite reading it more or less word for word (Rainbow Magic Fairies anyone? Fortunately she reads them to herself now, but I read a good 80+ of them before we got to that point. There's 40 hours of my life I wont get back!) I suspect my dd is the same, a little part of her brain skims over a book, does it's best to cobble together the words, while the rest is off doing other things. She has no idea what she's read and her brain hasn't had the same amount of practice putting words together, so when it's substituting words while she's not paying attention, it gets them wrong quite often. Give her a book she has to concentrate on and she's right as rain.
My dd is also a kid who likes attention for every moment of the day - has done literally since birth. She wont read by herself during the day, but she will read to herself at night after we have read to her - I think she's prepared to trade some attention for getting to stay up and be part of the world for a bit longer. No idea if that would work for your dd, just what has worked for us
