And Kayo especially could use someone to make her feel a little better. Frisk has a talent.

She nods as Frisk asks that yes, the cake. "Castles aren't magic..." She starts to protest, and then clamps her mouth shut as the realization that that argument doesn't really work, considering... well, everything that's happening right now. She poofed here somehow, and things you want and need appear as if by magic... somehow. A 'somehow' she can't explain with logic.

She moves on. "Why would someone need to study magic cake?" That's the stupidest question she's ever had to ask, but there it is.