It was her mother.
WandaVision: Wanda’s real origin in Marvel Comics
When Wanda Maximoff and her brother Pietro first appeared in X-Men #4 (1964), they were members of Magneto’s Brotherhood of Evil Mutants. There was no mention at this time of a relationship with Magneto.
Nineteen years later, Marvel had the twins learn they were Magneto’s children (Vision and the Scarlet Witch #4, 1983). The story was that they were born on Wundagore Mountain and were placed with the Maximoff family to raise them.
They believed these were their parents until that moment and then everything changed.
However, it was all a lie.
WandaVision Episode 8: Chaos magic, Scarlet Witch explained
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WandaVision Episode 8 Splays Wanda s Trauma for All to See
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