@frogeyed aww, that sounds adorable! I hope the chicken and the rabbit remain good friends and keep each other company. And I hope your complainy neighbor chills out :) Good luck!
I'm curious, since the white chicken was the one making the noise, why didn't you give her away and keep the smaller, quieter chickens? Also, is she all alone now? Chickens are social animals, she may not do well if she's completely alone. May start making noise to complain...
Then hit her with facts. Get facts from the town (animal control preferably). For example I'm pretty sure that after 8am it's fair game for noise. That's when people do construction, use leaf blowers, lawn mowers and other equipment MUCH louder than a chicken, and the neighbors have no grounds...
Talk to your town's animal control. In our town, that's who oversees animal ownership and all animal matters, whether wild or domestic. They are the bridge between animal owners and the police. Before you do anything with the police, go through animal control first. They are more sympathetic and...