[souffle]

I would keep them apart now. 3 groups don't seem as successful as pairs. I would do as you suggest and give her lots of attention but keep her cage away from the others so they can't see or hear each other. They do sulk for about 10 days when separated but after that get quite used to living alone and do very well.
I hope the pair will still together OK now. The escape likely caused an upset in the group and the scent would have changed setting off the bickering.