Henpecked Poor Thing

I had to rehome my rooster (I have new neighbors that moved in and are aggressively shitty with a doberman that is attracted to the crowing) and my little Louise went from SA victim type injuries to now being aggressively henpecked by the other hen to the point of severe injury.

I think the roo was protecting her from the other hen and now she has no one and I’m worried. I am about to head to the store and get some poultry wound treatment (ETA and wound concealer plus possibly an apron if it’s in stock) but how do I go about reintegrating once she is healed and breaking my other hen of this behavior?