2 million naira? That's a lot of money to be losing to a cat fish, but then, cannot be sorry can we? I think this how she'll eventually learn. When the effect of the lesson is not as painful, it's difficult to actually learn. So maybe next time she'll be careful. I think if you laughed, it wouldn't be a bad thing. When people laugh at her, she'll be inclined to not act in the way she has, next time.