The Tooth Fairy Classic/Dud ?

So anyway, a couple of days later, she remembers she should have something from the tooth fairy due, so dashes up to her pillow and retrieves the pound coin, with her letter untouched. Dawn tells her "Well, they are very busy on a night, and I think it's against tooth fairy law to leave letters". "But Abby got one!" says Amber. "Yeah, but then she only gets 20p for hers..." say I.