Can you blame her? That’s fun stuff!
But haul over to the grocery store and buy 1 gallon of white vinegar anyway. It should cost about $3.00.
After every flush, put a tiny amount (a spoonful or so) of vinegar into the toilet water. Put an even smaller portion into the Mock Toilet water.
Behold your cat’s aversion.
Behold the sanitary training conditions.
It may take weeks, but once you break her of the habit, you should be able to leave off using vinegar.