Board Thread:Speculation House/@comment-1733247-20151118073541/@comment-24891101-20151118074115

Everyone uses aura to withstand mighty blows. Hardly unique.

What you've described is basically the operation of her semblance, most likely. Her aura absorbs blows, like with everyone else, but the peculiarities of her semblance mean that instead of merely dissipating, the aura is converted to a ready-to-use form which is stored in the hair, which she releases for mighty blows. Said stored aura cannot be used for any other purpose.