Wonder Woman definitely got a nice buff in the last patch. She is one of the best characters in the game now, I'd say. Anytime you have one of the top characters in the hands of a good player, particularly one that knows the KF MU well, it isn't going to be a walk in the park. If she is ready for your slides and parries, particularly if they know which hits can't be parried, then it won't be as simple as if they didn't. WW has good air moves, and projectiles, so she isn't like another power character trying to get in close that you can easily jump-dash over as they try to back you into the corner.
There are better players who might have different opinions, I know I'm a random here, but I tend to try to go for maps that have nice interactables in the corners that I can use. Ferris and Atlantis are a couple that come to mind. On Ferris you can use everything but the rocket in the middle (well, for a divekick, yeah), the gas canisters, the tool cabinet, the rocket launcher on the right side, and the big metal tube on the left side.
I would also think it might not hurt to mix-up your game a little. If WW is expecting just either a Slide or a Parry, there's always trying some fast normals chained into a combo. For example, WW might not be expecting 1,1, MB Iceberg, into Slide, u3, u3, 2, 2, etc.... Or MB f3. Also knowing which moves have knock back. Just some ideas, hope they help.