User blog comment:Omega natsu2/Episode 177: The Eclipse Plan, Review./@comment-1359322-20140412080742/@comment-7418318-20140412104428

Well... Yukino has a room inside the castle, which would be the natural place for her to run to and cry about being a bad-luck magnet and Mira can just alter her appearance with transformation magic.

Thoguh I agree that it's a bit stupid for Yukino to waste the time to change her clothes, even if she ends up in her own room after splitting from the others.