It's very vague, but when I was a kid(in the mid 80's) I always use to rent this movie. This movie was even in BETA, there was a little girl in her room and she would eat these round glowing candies or something? And if she dropped them on the floor they would disappear. When the little girl would eat one she could walk threw her mirror into a fantasy world. I have been searching for this movie for over 10 years.

Try the hugga bunch