They have bowls that have "moats" around them. I know I used to use those for a dog we had when I was a child. I remember it working pretty well, but, my memory may not be correct. You just surround the food with water and it's not harmful to the cats or the ants, just a deterrent. You could even just put a heavy bowl with her food inside of another bowl with some water, and, see if that works at all.