I love a good chicken recovery story!!! I'm glad that she's much improved & continues toward a full recovery.
As for flock integration, perhaps you could try putting her in a separate pen in the run with everyone else, with separate food, water, grit & calcium. They'll need to see her to understand that she's part of the flock. Then maybe put a buddy in with her for a bit. Supervised interaction of course & if her buddy gets too saucy, it's chicken jail.
Lots of folks here have posted thoughts & experiences with integrating new members into their flocks.
The one thing I always did was once the intro had gone smoothly, I watched & if the lead hen was being a jerk, she got removed & quarantined. Chicken attitude adjustment. After a day or so of not being able to boss anyone around, she was usually pretty well behaved & glad to be back.
Next infraction was prior time + 1 day. Interact with me but no direct flock contact. She could hear 'em but there was no asserting of dominance. After that, just the threat of chicken jail was enough to get them 'Scared Straight!'
Hope your girls come around. Your hen is beautiful, by the way!