How about this? Some girl is reading her email or browsing online and realizes she somehow fell into the screen and is now a part of a picture she was looking at, or story she was reading. You could end it by her waking up and realizing it was a dream.... or not.
Try a dark twist on a classic fairy tale. Rapunzel, Alice in Wonderland, Beauty and the Beast, Little Red Riding Hood. Or if your friend doesn't like dark stories, try a modern twist on one of those stories. Hope I helped!