One thing they seem to do a lot in school guided reading groups is stop periodically to ask "what's going to happen next?". (I remember because it was given as the reason why DS shouldn't read more than the pages assigned, last year when this was happening!) I'm speculating, but maybe this is something we do subconsciously when reading, giving rise to the feeling of surprise when something unexpected happens (which is often when greater attention is needed), and maybe one cause of difficulty in reading comprehension might be not doing it. If this sounds plausible, it might be worth checking whether she does this to an extent that seems normal to you, and encouraging it if not?
