Margot was a huntress, one of those responsible for keeping the safety of the people of her nation. When she was called to deal with a dangerous bunnygirl, she thought nothing of the matter. It wasn't rare for some monster girls to turn to crime and banditry, just like members of any other race could do.
It didn't take her long to realize the people of Blue Falls weren't telling her everything about what was truly going on. They seemed almost embarrassed when mentions of the bunnygirl's attacks came.
Knowing there was more to the story, but understanding she wouldn't learn more from the villagers, she decided to seek out the monster girl herself. And when she found the bunnygirl almost rabid with need and realized the other female was a futa, she figured out what was going on.