Back to Sherwood (1999)

Robyn Hood is an ordinary teen in the present time, but her life takes a bizarre turn when she is strangely called to a magic talisman. When she dons it, she is thrown back to the time of the legendary outlaw hero, Robin Hood. Although she does return, she learns from her grandfather that she is the direct descendent of the outlaw. But now she learns that her family's line is threatened with non-existence when she learns that the foul sorceress, Brenan, has trapped Robin Hood and Maid Marian in another dimension and stolen a number of his magic talismans that will given by the king. Now she finds herself charged with the duty to periodically return to that time to oppose Brenan and the Sheriff of Nottingham's plans with the children of the original Merry Men and the sympathetic William, son of Sir Guy of Gisbourne, as her allies.