In the first film her powers are presented as something she was born with: ice and snow spring right out of her, and after a childhood accident in which Elsa hurt Anna, the trolls erased Anna's memory and the parents were told to hide Elsa's abilities. That stitched together the mystery for years. Then 'Frozen II' actually pulls the curtain.. Elsa's mother could have also been cursed, which would explain why Elsa was born with the powers and not actually cursed herself. Also, maybe there is another set of trolls but evil and something happened with them and Elsa's parents.
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The origins of Elsa's powers (planetary alignment, predestination, etc) were intentionally obscured in order to simplify the story. In a nutshell, she has powers because the plotline requires her to have powers. Jennifer: And that there's a connection between them, but yet it's not in your face, but it's just something that…. In Frozen 2, Anna and Elsa go to an enchanted forest to find out where Elsa's powers came from - and the ending (mostly) reveals the answers.