Love is blind it would seem.
And to be honest, I don't think Wanda has learned anything. She was utterly confident, to the point of obsession that Jillian would not break her spell. She -needs- jillian to do what she wants her to.
She's forgotten just how high the price of her last misjudgement of Jillian's character was, and she has fallen victim to the notion that she's somehow "won", everything else will be easy at this point.
In her own way, she's as bad as Stanley when it comes to being able to admit that she was wrong.
So, it's fairly obvious what's going to happen here, Jillian isn't going to respond how Wanda wants. And Wanda's arrogance will cost her dearly.
As far as Jillian's problem with stanley, he forced her to walk a terrible road just to get where she is now, and she might not have actually wanted it, or even liked it, but he took from her everything she knew; without her consent. Few people would be willing to forgive that.
Edit: That wasn't a criticism btw. Sometimes part of the fun in watching a train wreck, is in knowing that it's about to happen.