I think I read a post saying that we don’t kill her in her own raid. I mean, we’ve had, if I remember, at least 3 interactions with her and our attacks do nothing to her.
In the Well of Eternity dungeon, we can only interrupt her mind control ability and once we kill the mobs around her, she grows bored and has Varo’then (??) escort her somewhere else.
In Pre BFA Darkshore, and I think this is Alliance only, you and Malfurion try to take on Aszhara only for her to laugh at Malfurion for being a noob.
In Legion, we, the players are captured and Prince Farondis comes to save us, but is taunted by Aszhara who tries to get him to join her. His answer is to unleash his powers on her (this is the dude that can one shot elite mobs with Meteor). She merely shrugs and leaves after that.
So I don’t think we will be able to kill her. What I would love to see in her raid is a Halls if Reflection style fight. Instead of Arthas throwing ghouls and abominations at us and blocking our way with ice walls, it’s Aszhara throwing Murlocs and Nagas at us while blocking our way with tentacles.