Yes, because she doesn't know Oden's Haki, she only senses the sword's intimidating aura, probably also due to her own soul powers. But Kaido can clearly sense Oden's aura in it. Which is logical, since the user basically bestows his will upon the sword. It's not like it makes a difference, as Zoro isn't using Oden's Haki. But his presence/will is still carried on with the blade