D..
She may be used to this. There's nothing wrong with it. I still read to my MIDDLE SCHOOL kids before they went to bed, mom. I was reading tough chapter books to them too. We'd talk about the stories, too. I am the one who wanted to tuck them in, and it didn't bother them at all.
If they don't do it at home, then she may be missing her mom. PLEASE don't shame her for this or act like something is wrong with her. She'll never forget that if you do.
Dawn