red element design studio
But she could leave the window open too, and let the light in. The window in her room is pretty much centered on the wall, so there's no reason it could not be left exposed with the bed centered on it and the window dressed up with some curtains.
via little green notebook
isabella & max rooms
the lettered cottage
And sheers are a great way to both cover and let the light in.
I'll keep you posted on what she decides. Have you done this in a bedroom—or seen it done well?