Oh, yes. Anna is "Your Highness." It is a mere technicality in Eudio.

[ her eyebrows remain where they are, closer to her hairline. had he been doing research on the matter? it shouldn't be surprising, all things considered, though she wonders how much he has done related to their past conversations. ]

You don't have to call me "Your Majesty," [ elsa laughs, embarrassed, ducking her head and brushing stray hairs behind her ear. ] Elsa is perfectly fine here.