Knowing exactly what she needed to do to evolve, Mira didn't waste any time trying to become a Legendary Ice Beast.
She explored new lands, killed new beasts, consumed their flesh, grew more powerful, and searched for any ice treasures that could be useful to her.
Occasionally she'd find a nice, cold area to meditate, but most of Mira's time was actually spent hunting.
Years went by, and there wasn't anything different in Mira's routine. She hadn't found any humans, so there were no civilizations. The beasts in this world, especially the stronger ones, do not generally stay in groups because any and every beast in this world is merely seen as a large piece of flesh by other beasts.
Even Mira would kill weaker beasts because they are an easy source of energy.