There's a ghost amusing themself by trying, with limited success, to get the various parts of the play set to move, but when Duchess calls out their head comes up to look. Frisk swoops over to her, ghostly tail shifting with them.

"Wow! You look really... regal."

Like an Egyptian goddess! Nevermind that they're not supposed to really recognize her; they're just really pleased for her, since she seems to be enjoying it.