Thor is strong; Wanda is powerful. Power doesn't have to mean raw strength, but the tremendous demonstration of one's own ability. Thor could beat Wanda in an arm wrestling contest, but Thor is still susceptible to Wanda's mind powers. And we've seen that before, in Avengers: Age of Ultron.

Can Wanda defeat Thor?

Scarlet Witch EASILY Beat Thor in Marvel's Comics.

Is Wanda Maximoff more powerful than Thor?

Scarlet Witch Is Stronger Than Thor or Mjolnir Cap

Both were able to give Thanos a challenge, and their creativity in using their abilities speaks to their combat intelligence. ... When Wanda returned in Avengers: Endgame's Blip, her anger allowed her to nearly kill Thanos, a feat that people in the MCU still talk about.