Elsa's back story was initially centered around one significant event in an early version of Frozen, but thankfully, Disney decided to scrap it.
In this animated Disney musical, the newly crowned Queen Elsa accidentally uses her power to turn things into ice to curse her home in infinite winter. Her younger sister, Anna, teams up with a mountain man, his playful reindeer, and a living snowman to change the weather conditions and restore peace.
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Elsa, Frozen Wiki
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Elsa, Frozen Wiki
Everyone has their own opinion, this is mine, what's yours? (I didn't put the snow queen, because it's more of a nickname) : r/Frozen
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Elsa, Frozen Wiki