During their journey to Snow Maiden City, Mira spent the majority of her time trying to find a way to hide her tails and fox ears. She didn't have much of a problem hiding her fox ears as she could just lower and cover them with her hair, but her tails are different.
No matter how hard she tried, she could not find a way to hide them. Maybe if she only had one tail, she could just wrap it around her body and cover it with a slightly oversized robe, but having nine tails is a different story.
Her tails are essentially a new set of limbs that also act as a secondary energy container. Since she can't polymorph her arms or absorb them into her body, it'd only make sense that she also can't do it for her tails.
She can, however, move the energy within each tail into her body which will flatten them out a bit, but there's a slight problem in doing that.
