Or more easy!
A Alternate reality Moira comes to prime reality after being the last mutant and living person in her universe.
Furious at the dead of every live of the universe searchs a earth withouth "Her" to come. Not knowing that in this earth we have a "Moira" but that Moira is a "RoboMonster"
So we have a Future good Moira and Present Evil Robo Moira.