This is seriously how I reacted to this scene thanks to Danbooru:
And then, Homura achieved a level of closeness with Madoka she could never have imagined if she had simply saved her in the flesh... their very COSMOS intertwined and united!!! EPIC COSMIC SKINSHIP END! ... but then she left, dammit!
Well, the wish was specific, and she killed her own witch form(?) Re-organized the universe and became god, so that girls wont suffer from the rules that turns magical girls into witches.
Yet, all the suffering and curses have to go somewhere . . . Thus god's best friend shall have the duty to exterminate