No it has nor worsened. It could be because of my rooster, who now doesn't let any one in the flock eat with him or else he'll peck them. I don't suspect she's being bullied as the rest of her flockmates are her siblings and they've been together their whole life. She's also towards the top of the pecking order when the chickens are asserting themselves.
I don't mean to scare you but just because chick hatchmates grow up together doesn't mean they don't get into pecking order squabbles to downright battles as adults. There's not too much sentimental bonding with adult chickens as they are out to preserve their own well-being first and establish themselves within the ranks. A fostered LF chiick as an adult killed its own foster momma Silkie.
Meanwhile I hope you discover the problem with your Dom and that she heals. I have a vet 10 minutes away for my chickens; otherwise I'd be a shaking mess trying to diagnose or treat my own birds LOL!