I’m conflicted about this and I hope what this is NOT is a “post-mortem” redemption for the character, because it’s undeserved.
This is the same ruler that allowed the Legion to feed Nightborne citizens into their soul engines, that exiled and cut off dissidents from the sustenance that they needed, that kept Nightborne in cages to wither and die, and killed off the last remaining members of the Moonguard. She is evil.
Go back and save Suramar, but make sure you die in the process for good this time, Elisande. And pass on the title of Grand Magistrix to Thalyssra, you rat.
Edit: That being said, provided that this is indeed an alternate universe Elisande and not the one we defeated in Legion, then I’m more receptive to them possibly returning to aid the Nightborne in the future.