bully chicken

Since losing my top hen her second in charge has took over, however she is only interested in food always has been... She is not sorting out the problems that have arose since taking over. They have been together for over two year's ... The bottom ranked hen has now taken to torturing (that is the only way to describe ) the ducks that they are with ... She is not being told by top bird at all unless she eats ... Have had to lock hens in run so ducks can actually heal and eat ... I don't know if anyone has had same problem or know if they will need to be separated all the time from now :-(

Thank you for you reply ... I have put hens away in small run for today to give ducks a break ... They have all been together for over two years ... I have noticed that the duck being picked on is sitting on a. Clutch of eggs ... Didn't think that khakis  went broody well that's what farm told me and this is first time one of my ducks have sat on eggs ... I am gonna integrate the hens slowly back in with ducks over next week .