In Avengers: Age of Ultron, Wanda influences Avengers' consciousness.
Pietro Maximoff: What can I do?
Wanda Maximoff: Ah, it hurts.
Pietro Maximoff: I'm gonna kill him. I'll be right back.
Wanda Maximoff: No. I'm over it. I want...I want to finish the plan. [looking at the Quinjet where Banner is waiting] I want the big one. [after Stark corners Ultron]
How did she know that Bruce is Hulk? I mean, she saw him only as Hulk, and not as Bruce Banner.