Thank you all for all of the wonderful advice!
Here is the latest in the Sacred Princess saga:
This morning when I went to bring the horses in, I approached her without a halter. She came right to me. I rubbed her ears and face and put pressure on her pole. She was fine with all of it. I did not attempt to restrain her in any way, just took advantage of the moment to let kind of say "are we ok?". I then gave her some hay (no grain), but outside. (remember my rule no-one in the barn loose and unrestrained.)
This evening when I went to feed everyone (she had now missed 3 meals by the way except for the hay I gave her) she came to barn gate. I asked her if she was ready to come in and put her halter on my shoulder (where I normally carry them all as I gather the horse to bring them in.) I rubbed her halter against her neck and back. She turned on me and I gave her a fine "crack" on her butt (with my fist as I did not have a whip). She stepped away then came back and when she did I took the lead rope and began to rub it on her neck and face and head. Soon I had the lead rope around her neck with no objection. She immediately became submissive and walked, and whoaed on command. She yielded and backed up on command, and was generally cooperative. All this with no halter but just the lead rope losely around her neck.
I brought her in the barn with the lead rope tight enough so she remembered she was restrained, and put her in her stall, where she was fed with the others. She was obviously relieved. When it came time to move her back out to pasture, she resisted a bit, turning away but this time not completely around. When she again came to me I slid the lead rope around her neck and again did some ground exercises (walk, whoa, back, yield, etc). She was fine with all of it. I rubbed the halter on her face, but did not attempt to put it on her yet and released her into the pasture.
I plan on continuing with the lead rope only for a couple of days, rubbing the halter on her, each time getting a bit closer to putting it on until I am certain I can get it on her without objection.
It would seem that the comments about her being hurt by the halter when she pulled back appear to be sound and she is probably feeling a little better today so she is giving me a little more cooperation. As she gets back to normal, so too will our routine. I have patience so the time it takes is no problem.
With today's demonstration, I am feeling a little better. She seems to remember that I am, at least to the degree I was, in charge. She did not react violently to crack on her butt, and immediately after, came right to me. She obeyed my instruction and re-assumed her submissive posture when she felt any resistence on her neck. All in all I think we are on the way back.
Again thanks for the prompt and very useful suggestions