After first reading your fantastic story of their first fight, I was delighted to read there'd be a rematch, even more thrilled to be invited to vote on the winner.
After such a devastating and humiliating beating at the hands of her ruthless older neighbour, I believe the poll score reflects the reality that your wife's continued aggression towards Christine was "fuelled" by raw emotions rather than genuine self-confidence. I think the mature fighter crushed that out of her in the initial beating like the ground she crushed as she strode away in her stiletto heeled ankle boots.
As offended as Christine was to be challenged to a fight by your skinnier wife in the FIRST instance, I'd imagine she will double down on her humiliating punishment after this hierarchy-reinforcing defeat.