Wickellia

Wickellia is Delancy's princess assistant. We see her for the very first time when Blair goes inside Princess Charm School, also in the library when she's talking with Miss Privet. Delancy asks her to put in Blair's skirt the tablecloth, then Dame Devin also asks her to rip Blair, Hadley and Isla's uniforms while they're in the spa.

Obviously, she's mean like the princess she assists.