At one point in the Marvel Comics lore, Wanda Maximoff (Elizabeth Olsen) was a mutant alongside her brother Pietro/Quicksilver and their father Magneto. That was changed in the character’s most recent solo run, which retconned her into being a sorceress with access to Chaos Magic.

from Pocket –https://comicbook.com/tv-shows/news/wandavision-spoilers-is-scarlet-witch-a-mutant-mcu/