S.S.
Use your mommy-magic. When our youngest had the same problem, I started a bedtime routine where I take fairy dust from behind my ear (where the fairies leave it at night), warm it between my fingers, say the magic words "No bad dreams, no monsters", and blow it at her. Then comes the second load of fairy dust with the magic words "only good dreams". Then we draw a "monster cage" out of golden threads over her bed that no monsters can get through, because only people who love you can get through it. She uses her imagination to visualize it. I sometimes "magic" her finger so she can add slides and swings for the fairies to the cage as she is falling asleep.
Work whatever magic you feel comfortable with that involves her imagination and I suspect it will get better.
We also got rid of our television and discovered we have so much more time together. It was the best decision we ever made. Good luck, and enjoy your imaginative, creative daughter. She sounds like lots of fun.