Then again, there are definitely arguments to be made for the case that it's better for her not to return. By the time we were reintroduced to Moira in X-Men: Apocalypse (she had sat out in X-Men: Days of Future Past), the character had already gone on to a new stage in her life, complete with a family to call her own. For her to suddenly drop that and become a new member of the X-Men supporting cast might not line up with her characterization.