scifi movie ; fantasy

i saw this movie about 5 years ago In the beginning there were these two sisters and they were playing in the woods when they heard like a child crying . they looked for who was crying and they found a cave where there was a girl in there with her back towards them and she was making crying noises so the older sister went up to her and then the girl turned around and i forgot what happens next . I know that the girl goes missing and then its years later where the little sister finds out where shes at and its like a different kingdom and her sister turned evil and is like a witch i believe .its colored and i watched it on the scifi channel . my memory is foggy but it always bothers me that i cant figure out what movie it is .

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