Just drawing ideas that popped into my mind: part of the story when Sorbet and Vanille are not so close yet. ^^
To prevent Sorbet sneaking into the ruins alone, Vanille keeps an eye on her and makes her work as a servant.
I imagine Vanille's family having other servants and guards, and now there is a grumpy Sorbet working among them. :3
I have a feeling that Sorbet doesn't like the uniform. :D