Let me tell you how I do it. I have 15 (er, um, well, sorta 16?) cats. 11 of which eat in their own designated carriers [door closed]. 1cat is in the room with the carriers (cat room), 1 in our middle bedroom, 1 in the kitchen on the top most cabinet and 2 in the living room. The 2 in the LR are monitored, but usually eat together peacefully.

The cats have been trained NOT to go up on the kitchen cabinet as I feed Fern first. They need to follow me to their room, and they do so quite willingly.

You would be surprised how quickly the new ones to this routine catch on to when are where they get their food. And I alwyas know that they are getting exactly what they are suppose to be getting.

There is NO free feeding though, so your Bonnie would have to learn to eat at breakfast and dinner, and not be able to nibble all day. But trust me, she could learn. Each of my cats learned at incredible speed how this system works.

I don't know how other multi cat houses do it. Good luck.