My aunt used to own it on vhs. I would watch it while visiting for the summer. A tomboyish girl goes back in time and becomes her grandfathers sister. Helping to not loose the family farm, she works with her brother to help him. Then in order to get back home she makes a sort of rocket that slides out of the barn window and she is returned to modern day. Then when she finally sees her grandfather, come to out her grandfather knew his whole life that his granddaughter would be coming back in time. But he could never say anything until she finally went. And at the end the grandfather reveils a hospital named after his sister that ended up having some sort of disease or something. I know it is weird but please help.thanks, jenvic118

Split Infinity: A Gift From the Past (1992) (http://www.amazon.com/Split-Infinity-Gift-Melora-Slover/dp/B0001V1M4G)

Wow, you are awesome. That is the movie. Thank you so much!!