How about watching *part* of the movie by programming the TV's sleep timer for a shorter period of time?
Another thought that comes to mind: stories on audiotape or CD. We have some by Lori Lite, which are more like guided imagery or meditations for kids - and they work like a charm. Or, you and she could record some of her favorites and she could listen to them. I also remember seeing some kind of dvd at BBB (probably at lots of places) - it's one of those displays like the one with the CD selections where you can press a button to sample the CD. They had wordless videos with a maybe a little music and some kind of visual. Some were targeted for relaxation (aha!).
My final thought is that changing the movie might not be important. If she's getting enough and good enough sleep, then it's not broken and doesn't need fixing.