I'm still a bit fuzzy on the timeline of events though. Presumably, Agatha has been looking for the Scarlet Witch for some time now. And its not like Wanda has been keeping her powers a secret. But that still wouldn't explain how Agatha came to be inside Westview before S.W.O.R.D was even aware of the anomaly. She couldn't have known that Wanda would go to Westview, unless she was the one who left Wanda that property deed.
But even then, how was Agatha able to resist Wanda's reality warping powers? Is she naturally immune? I would presume not. The only way she would be immune, is if she made magical preparations before she either entered the anomaly, or before it even manifested. I suppose if she were the one that left the deed in Wanda's car, she could have prepped her own little purple sanctum underneath Westview.
But then what is her ultimate goal? I presume one of her goals was to locate and confirm Wanda as the Scarlet Witch. The other was to learn how she created the Hex. But it also seems she really tried everything she could to break Wanda out of her manufactured reality. Did she need to do this to learn what she wanted to learn?
If her goal is to feast on Wanda's powers, as she did on the magic of her coven, then why lure her a warded sanctum where she can't use her powers? Or why not allow the Hex to persist, feasting on its existence? Maybe she needed to know for sure that Wanda was the Scarlet Witch first?
At the end of the episode we do see Agatha face Wanda outside the sanctum, while holding her children captive, which may be a ploy to get Wanda to use her powers against her. But would Agatha even be able to handle the power of the mindstone, even if it is just a fraction of it? It also seems like a strategic error to show Wanda her sanctum and her magic book, if she intends to be Wanda's enemy. Such knowledge could easily be used against her.
Or will we see a twist, where Wanda teams up with Agatha against S.W.O.R.D?