https://wow.gamepedia.com/Moon_Priestess_Amara
Seems like someone found out who this npc was prior. Fairly minor NPC living in Teldrassil. My first encounter with a mounted NPC that made me really want one of those cool sabercat mounts as a noob. Unfortunately that leaves no hint as to her role in future content.
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It's nothing new, that's for sure. Play through the Silverpine questline and you see plenty of it.
Val'kyr: Yo, you're dead now. You either serve us or get put back in the ground where we found you.
Zombies: M'kay, fair enough.
With the handwave excuse as well of some of them being briefly "crazed" after being rezzed and able to be directed towards enemies.