Wanda said she didn't know how all this started. Maybe that's true, but given that it's immediately followed up by Pietro's appearance, and it being the wrong Pietro, and I think that's real.
Also, the digital "screen" around the Hex didn't look anything like Wanda's powers, until she did whatever she did when she came out and went back in, but that's more of a corruption of something that already existed; if it were her creation, she wouldn't have had to do that.
Things seem out of Wanda's control semi-regularly, despite her clearly being so aware of what's going on that she stormed out of the Hex and told SWORD to fuck off, before going back in. She's not trapped in there, she knows what's happening, and she can have some influence, but a lot of that influence appears subconscious. Like Pietro showing up.
If this is a technological reality warp of some kind, which could explain the hexagon outline and the digital "screen" effect on the border and all that, I can easily see Wanda seizing it to try and use it to rebuild Vision, but not having complete control of the process.
At least the current episode explains why SWORD is actually involved, since we now know Wanda stole Vision's body (which would be under their jurisdiction). Before this, we didn't have any direct connection to explain SWORD being there over, say, SHIELD. Given that SWORD is exclusively focused on AI and robots and the like.