Maleficent went back in time when she was defeated in KH1. However, instead of going back in time in her world line she appeared in Enchanted Dominion in UX world line. In UX, she is currently trapped in that Enchanted Dominion by someone knows as 'the darkness' that fears her knowledge of the future. Combined with the secret reports which refer to a witch from the future, 'the darkness' is probably Luxu and Maleficent in future UX updates will use her knowledge of the future in her worldline to help the Dandelions cross back over. Though this could be a fake out.
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