I would get this movie frequently at our local vhs retail place. I’m 30 now and would get it when I was 8-10. Not sure if it was in color or black and white. I feel like it was about sister(s) who would travel through a mirror. They would ride in something like a gondola and there was dancing and clouds. The Number 7 is sticking out in my brain.  Not sure if there were multiple sisters or I’m pretty positive it was part of a larger fairytale collection of movies.

Please help!