I remember watching this movie when I was little where it was a brother and sister, the brother found this magical place and somehow the sister went there and something happened where she falls under a sleeping spell like Snow White and is places on a stone slab, I also kinda remember there being monsters of some sort and at the end of the movie they moved because of the monsters. And they kids got to the realm thought a closet
Narnia?
Ya it sounds like “The Lion, The Witch, and The Wardrobe”, or some version of it, since the kids (2 girls and a boy) get to a magical snowy land through a closet/wardrobe in that movie.