We have a small flock of 4 * 24 week old wyandotte and australorp, they have got along great for more than 4 months but just 2 days ago 3 of them decided it was time to attack our only laying wyandotte. she is puffing up her feathers and they are pecking her neck and wattles. We have no idea how this all started and would like some help to know how to fix it. Thanks in advance for all help advice.