During the Captain America: Civil War Team Captain America press conference with Clevver Movies, the cast sat down to share some thoughts on their characters and what their arc consists of in the film.
Co-Director Joe Russo touched on Scarlet Witch's arc during Civil War, and how the character is just starting to come into her own. He also right at the tail end confirmed that the character will be a part of the upcoming Avengers: Infinity War Part 1.
"She is on a growth arc, and it is part of her development. It is very tricky with powerful characters, because unless they have an internal struggle or a flaw that limits them then they do become limitless, and the storytelling becomes muddled and not very interesting. You know she could've stopped that fight at the airport in 5 seconds if she were at the peak of her powers, so it really has to do her character specifically going on a journey to understand what the limits of her powers are. She makes a mistake very early in the movie that sets her back, and we'll get to see where she goes in Infinity War."
Scarlet Witch is one of the most interesting characters in the Marvel Universe, and Elizabeth Olsen has done a fantastic job bringing that character to life in a grounded way. Both she and Vision have progressive character arcs in Civil War, and should be in very different places when Avengers: Infinity War Part 1 debuts in theaters on May 4th, 2018.