my 3 barred rocks have teamed up against one of my rhode island reds. the other RIR sometimes defends her and sometimes doesn't. she is also the only one molting right now and had a minor stomach problem that was resolved by me unblocking her system about a month ago. i have another flock of chickens (2 more hens) in a different coop but my RIR goes after them and plucks them. any idea how to stop her from being bullied? also how can i mix all of my hens together without the ripping out of feathers?