Susan, a couple of things come to mind. Does she wear a collar, and could the tags be clinking against the bowl?
Have you tried different bowls and or plates? Metal, ceramic, plastic, taller, shorter, deeper, straight sides vs sloped etc? Also different colors?
I have a friend whose dog will only eat out of a wooden salad bowl. Go figure!
There's no telling what Bonnie's problem with bowls are, but I agree with Tina. Bonnie knows what the problem is! It's up to you to figure it out.