I loved reading too. But I must agree once I'm into a book I can't put it down. I also can't switch off to go to sleep. I become so absorbed in what I am reading that I just can't sleep.

I would suggest definitely breaking up the reading before sleep. See how you go with a shower in between, if not you might have to go more drastic, like introduce a quiet activity between reading and bed, just to help her brain switch off.