One idea would be to count how many times Kate fails to follow instructions (stay here; don't follow us; etc.), and thus gets people into trouble.

As a reader (and watcher) of GoT, I think the biggest emotional impact for me (particularly in the books) was that Arya was FINALLY so close to being "saved" (she's literally at the walls of the Frey's when the massacre starts), only to see her mother, brother, and yet another direwolf die right in front of her, and…