There can be an adjustment in pecking order whenever one has had a bout of illness. Have any of your hens started molting this year yet? What are ages? Mine are all in various stages of molting, and they have taken a break from laying eggs while they regrow feathers. Here are a list of signs you may see with MG:
https://thepoultrysite.com/disease-...tion-m-g-chronic-respiratory-disease-chickens
https://thepoultrysite.com/disease-...tion-m-g-chronic-respiratory-disease-chickens