Yeah, that is a good way to get her room cleaned :) Never worked on me...I knew I could get her to say yes anyway.
I will NOT say "yes" unless it's clean. Their friendship is interesting--Dana's mom keeps their house spotless all the time. I'm sure she (Dana's mom) about has a heart attack when she sees ours. It's not nasty filthy dirty, but there are usually dishes in the sink and laundry to be folded.
On the other hand, Dana has NO pets. I mean NONE. They have a little fish pond out back, and bring the fish in for the winter, but that is ALL. And her mom will NOT get her any sort of pet, even a beta fish or hamster. So Dana just loves to come over and help with all of our pets.