Ha ha she has been very feisty with me too - I went in yesterday (day 18) to make sure the coop is all clean and tidy up the shavings / try to push some back into the container she is in and generally tidy so I dont' have to bother her at all now until they hatch and she was pecking at me like I was a grain blockDon't worry about it. She will turn into the hen from he11 with regard to protecting them when the chicks hatch. None of the other hens will dare get near the Tasmanian Devil.

It seems to be working well, she can see the others and they her but she is 'safe'.This is the best argument for a separate but small coop or pen for your setting hen to incubate in.
When should I open the gate so they can all mingle?