I'm becoming more inclined that not only is Wanda not responsible for the Hex, but now I also wonder if that was really Wanda who confronted SWORD outside of the bubble. As I questioned earlier, it seemingly happened at the same time as Wanda and the twins were looking for Sparky and I came up with different explanations for how that happened (if it was even necessary), but perhaps the explanation is the easiest one: It was actually Agnes masquerading as Wanda. That would fit in with the idea that Agnes is Jimmy's witness but was disguised as a man at the time.
Oh, that's an interesting thought that I had considered. That would give Agnes direct motivation for keeping Wanda captive than merely because she has magical powers.