Can't remember anything about this movie except it was about a girl in modern time how tries on a white dress and is then taken back to the 1800's roughly and lives the life of a dead girl lead by her ghost pretty sure there was child slavery involved at the end she was brought back to modern time

Sounds like Playing Beatie Bow (http://www.answers.com/topic/playing-beatie-bow-film)

Thanks heaps Quinn F that's awesome its been bugging me for ages

Glad to help.