Zumi noticed that Yammo wasn't saying anything, though she was looking at her, and obviously letting her take the lead; well, fine, be that way.
Okay, that was unfair- not only was it Zumi he was asking the favor of, and with good reason, since Yammo didn't know much beyond travel-worthy functional either, but Zumi was the one that knew Link the best, almost at all. It may not have taken a genius to notice the caring in Link's tone when he said this was important to the queen, but only someone who'd spent any significant time with him would catch just how much caring there was.
She gave him a tiny smile, at once disappointed and fond. "If I didn't know better, I'd think you hadn't been telling the truth earlier about there not being anything between you two."