Sarah can’t. She was jealous of Emmy’s husband. And she waited for the right moment to make her move.
When Emmy was alone, she heard a knock on the door. At the entrance, a stranger began to woo her, claiming that she was smart in ordering his “services”. At this moment, Emmy’s spouse, John, showed up. He was suspicious of a random guy flirting with his wife, but not yet convinced of anything. That’s when Sarah popped out, fuelling their fight with her lies.