It's not fair, to make her laugh like that. It's not fair at all, but she's helpless against it, and her thoughts from before are swept away in a tide of just laughing at how stupid it all is - sometimes you just need something completely different. And she's trying to regain composure, she really is, but she keeps giggling, calming down and then having to breathe very slow to come back to herself.

If Erin says anything else it's liable to set her off again.