Before you can unlock Maleficent as a villager in Disney Dreamlight Valley, you need to have completed the first part of the Storybook Vale DLC. This includes completing all the Maleficent and Hades quests, and having every area of the map unlocked. If you haven't done this already, you've still got quite a bit of work to do (and a lot of Storybook Magic to collect) before Maleficent will move in.
However, if you have completed the Storm of Stories quest already, then you're ready invite Maleficent to your island by completing three new quests—Maleficent's Gift quest, the Spinning Wheel quest, and Maleficent's Demise. You need to complete all three of these quests to unlock Maleficent as a permanent resident, so here's what you need to do...
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How to unlock Maleficent in Disney Dreamlight Valley
Source: PC Gamer (opens in a new tab)