It really doesn't - as Wanda's feats also include casual reality warping on large scales, and easily trouncing Kamar-Taj and everyone who works with them. They include her forcing her way out of the mirror dimension, something supposed to be impossible, and instantly healing from the damage taken doing so. They include treating Strange like a chump. The fact that they made her work at all (well, Monica did, everyone else was chaff once she iced Black Bolt) show that they've got a little something going for them.
But as I said from the get go, Superman solos this.