hiCandJHens,
You and I have almost the same situation (I'm sorry about the fox...it is heart wrenching). I hope someone answers your post (I am in one of the other threads) because I need some wisdom here as well. But, as an fyi, we took our bossy hen out of the henhouse for 2 nights and she slept in a dog crate. The 3 younger ones still went to the nestbox, where they have been relegated since Harriet wouldn't let them roost. We put them on the roost with the elder who is ok, mostly, with them but they were unsure about the whole transaction. As soon as we let Harriet out with them in the morning (they range when we are home) she went for them, as usual, and they cowered, as usual.
So, even though I had read remving the offender and upsetting the norm might help, it seems if it is to work at all, 2 nights isn't enough (and maybe they have to be removed entirely for a bit, not just at night.).
One weird thing is that Harriet is upset/unhappy in general-she stays in the vicinity of the others but a bit apart and was yelling a LOT today, in a way that said she was just not digging life just now. It is kind of sad (reminds me of tough elementary school schoolyards?) because she is a favorite of mine.
I hope your crew shapes up and becomes a whole flock, however it plays out. Let me know id you discover a good method.
Trish