Have you considered removing the cast time on her wall? Or bugfixing it so that people can't just walk through it sometimes?
I think removing the cast time on her wall would be a bad change for the champion. Being able to consistently stuff movement skills would require her to be weaker in other areas of her kit and would also be most powerful in support, because that utility doesn't scale with gold, along with encouraging her to hold on to her wall to use it reactively instead of proactively setting it down to define the battlefield.
If you have specific reproduction steps for people walking through the wall, then I can take a look, but I haven't seen it myself.