stillsearching

Hey, Im super glad i found this thread because I have been looking for a certian movie for about 15 years and maybe someone can finally help!!! I cant remember its name and I look for it every time Im in a video store but it seems I had the only copy ( it got destroyed long ago). It started with a little girl and she was upset and ran to her barn. She had a horse and I dont remember if she fell asleep or what but when she walked outside again, her horse was white and she was somewhere else on a starry night. I dont remember many more details after this except that at one point she gets sprayed with this evil potion that turns her and her dress darker as well as this heart on her dress. I remember the heart on her dress very well, so I think it had some significance. Sorry I cant give many more details, Iwas pretty young when I saw it. I hope someone knows what this is ( it was NOT sailor moon so dont offer that suggestion) thanks!