The Problem is, that she starts to open the windows, as soon as she comes out of the toilet. She is not going straight back to her seat, as you have written.
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Well, there is a way to stall her a bit longer. I was assuming this was a bug, but now it dawns on me that you forgot to do something to make unclogging the toilet harder for her...
You need to make sure she doesn't have a toilet plunger when the toilet is clogged. You need to get rid of that toilet plunger for good!