[Elsa could likely get Yuuki in a great deal of trouble depending on how she chooses to react - and everything about today has her frazzled enough that she doesn't appreciate having pranks played on her. But... being angry would be terrible undiplomatic, especially considering she's hardly the ruler displaying the most goodwill during negotiations today.]
Your Majesty. She's very young... I'm sure she'll learn soon enough. [Apology accepted. She's keeping the snowflake coating for now because 1)she's not offended, see, and 2)it's actually pretty and she likes it.]