The Mother is the creator of the universe, her pain is what caused it to be what it was.
When she decided to move on, she made Nina to bring good to it as there was nothing else she could do since the universe just mirrored her surroundings. A combination of her fears, her traumas, and her wonder of what could have been.

She was there every step of the way with the heroes that changed the worlds until her passing.

#bnd #bndlore