The glamour I saw her use didn't alter her face, or her stature. I'm not sure if this is because she felt it was beneath her to change her features in a more thorough way, or if doing so was simply beyond her, but that may still be the case.

Even if it is not—listen for the sound of hooves. The glamour is only a visual effect, so it doesn't actually change her body, nor hide the sound of her motion.