carrrnuttt
Didactic
My theory:
Instead of famously saying, “No more mutants,” she is going to say, “No more miracles.” This is what she and her brother were called by Hydra. And that phrase will turn the House of M moment on its head, giving rise to mutants, rather than wiping them out.
Also, it shows that “Dead is Dead” in the MCU outside of a dusting related to the Snap and the Infinity Stones. She can’t bring back her version of her brother, who died from gunshot wounds. So she reached across the Multiverse and grabbed one still in existence. That also foreshadows that she can’t really bring back her version of Vision outside of reanimating him inside of Westview.
There's a fan theory that speculates that what's happening to Monica is that her X-genes are being activated by Wanda's Hex and that the end of the show is her Hex ends up encompassing the Earth, and this is how we end up getting Mutants in the MCU and also calls Dr. Strange into the picture and we up with the Multiverse of Madness.