We never see anything happens after Moira dies because Moira was dead & she cannot know what happens after she is dead. Her power is explicitly stated to be reincarnation, so yeah sure she retains whatever knowledge she collected while she was alive. I think this could give her a chance of redemption: what if a character from a universe from moira's previous life visit current 616 to show her that her work actually mattered & saved the mutants? There are a lot of cool concepts from Moira previous life that I want to see again.
Also, there are a lot of continuity errors that I do not like, & I would not mind if the writers use this device to shove them off a cliff