Where did her feathers go?

[Issosilly]

My light brahma is now missing a lot of feathers. I did have to trim this area back a while aho cause she had a lot of poop stuck and it was blocking her vent area but now there is no feathers there at all. Did she molt them or is she being bullied? She doesn't seen to be in any pain and is acting normally shes just a little naked now. Doesnt look like any blood or open wounds but need an expert to help figure this one out