Thanks for playing, just watched the video.
It looks like you were playing the version before the update I pushed yesterday at first, and there's a lot of things that should be better in the latter part of the video after the update. (The sections where you can see her silhouette through the walls are after the update).
I've also just nerfed the poison a little bit earlier today, but in actuality her grabs rarely end up connecting as long as you keep moving, and it's really a fight that's meant to push the player into making full use of their abilities and mobility. If you're up to try again, you can try to use the other abilities more, since they're all quite powerful in their own way once you figure out how to use them.