BTW this is not a boasting post
It is, though, isn't it? You know full well that an hour a day is a decent amount of time for a 12-year-old to be reading for fun.
I would like her reading more now that winter is coming in
Why? Is reading somehow more important in winter than summer?
Ultimately, reading for pleasure is a nice thing to do, if you enjoy it. But you can't make a child enjoy it and if you try to push her to read, she will start to see it as a chore. I speak as someone who gets through around 70-80 books a year and runs a book review site when I say that reading is a hobby. It's entertainment. Nobody should be forced to read more than they want to, any more than they should be forced to watch TV or listen to music or play a board game.
Clearly, literacy is important, but there are other ways of achieving a decent standard of literacy than reading fiction for pleasure.
Your kid likes reading for an hour or so. That's fine. Just leave her alone.