Reading books or magazines, talking or messaging with friends through phone (if she can keep it), listening to music with iPod, crosswords, drawing, making jewels, learning a language with a book, writing letters for relatives and friends, keeping a diary in which she can write her thoughts and feelings and what she wants to do when you can go out and sketching drawings and whatever she wants.
If I have other ideas I'll tell you
And try to go and see her as often as you can! How long is she supposed to stay there?