I guess Shou kinda thought that because Chen's a cat, and is being carried by a different animal-like character (Ran), she probably thought that because she's a cat-type animal (tiger), she should be carried by a different animal-type character, too, and chose Nazrin, since she's a mouse.
Unfortunately, she was reading the whole thing backwards, as she was supposed to carry her mousy subordinate, not the other way around.