Since you are taking away the speedblitz, I'm going to go against the general opinion that this is spite and say that IW stands a good chance of making a fight of it. It's a question of whether she is willing to do lethal damage in this situation.
IW's force fields have indeed held off some pretty powerful characters, at least for a short while. I have no doubt that WW could eventually pound through them, but not quickly. That would give IW time to try other things:
1) What she threatened to do to the Wizard - give WW a cardiac arrest by blocking the heart valves. We know IW can do it, and we know WW is susceptible to it because she has been KO'd by it before.
2) Blades, blades, and more blades. IW could stab her with tons of them from all directions and there is no way WW could block them all. If all else fails cut from the inside.
3) Brain clot. Since heart stop has been shown to work on WW this almost certainly would too.
4) Cut off her oxygen by blocking the lungs from working even if WW manages to take a deep breath first.
5) Blind her. It would slow her down a bit. I doubt it would be necessary in this fight but IW could do it.