The fact that Elizabeth Olsen insists that Wanda hasn’t lost her Sokovian accent might mean that fans will hear it again, perhaps later on in WandaVision’s run. Maybe during a tense moment with Wanda in distress, her accent last heard in Avengers: Age of Ultron might slip through.
When the topic of Wanda’s accent came up on a recent episode of Collider Ladies Night with E
lizabeth Olsen, she decided to address the issue and state that Wanda’s accent “hasn’t gone anywhere” and further implies that Wanda simply hides it, especially in WandaVision when “she is playing the role of being in an American sitcom.”
Olsen explains that her accent was created alongside Aaron Taylor-Johnson’s own accent, which compensated for his British accent:
“So, the Sokovia accent was created by me and Aaron and our dialect coach because it’s a fake country and we could find different sources of Slavic sounds. And we wanted to make sure it didn’t sound Russian because Black Widow speaks Russian, and so we just needed to sound more like Slovakian. So we created these sound changes that worked for Aaron’s British accent going to Slovakia basically and my American accent so that we sounded related.”
It seems to be implied by Elizabeth Olsen that Wanda hasn’t lost her Sokovian accent, but that she’s merely hiding it well in Wandavision:
“And then all of a sudden, all these different characters had to speak it in different films. So the Sokovian accent took a lot of time. It hasn’t gone anywhere. There have been reasons for everything. It lightened up when she started living in the States, and in WandaVision she is playing the role of being in an American sitcom and so it’s not gone. It is absolutely still there.”
It is also possible that Olsen is saving face with certain fans disappointed that Wanda no longer has her accent. Most of her explanation is quite similar to the Russo’s, who also said that Wanda has been hiding it, even when it was just between herself and Vision like in Avengers: Infinity War. It could be interesting if Wanda purposefully attempted to bury that part of herself. Wanda’s accent slipping could further show the illusion she’s built up for herself breaking.