Sorry clarify:
I would make her stop being a broody. A few days of separation can help from her two pullets. But, only if they are ready to be on their own. I would sneak all three of them in at night after Bobby is done being a broody. Usually once a hen has been separated from her babes, she stopps the fluffing out and protection needs. But, I will say this is not a fool proof plan b/c I have a few hens myself that no matter how hard I try It is soooooo hard to break the cycle and even when I separate them they still do the broody mamma routine.
Either way with or without trying to break the broody out of her, ALWAYS, sneak new birds in after Dark. Use minimal light when going in with them and make sure they are calm before you gently place them on the roost. (don't attempt the roost with silkies) Then sneak out and I'm sure you will hear a few purrs from the girls in the coop but, they will not attack her at night. Then at first light make sure you are up and out there to open up the coop and give her ample space to get out of harms way.
Remember, chickens will always form a chain of pecking order with or without you trying to mediate. It's something that needs to be done and unfortunately it is very hard to watch. But, after a few days they ususally settle down.
Now, if you had a rooster.............that would solve alot of the hen pecking! But, I know some of you can not have them.
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