I have Gnarlroot item, but can't start Power of Dreams?

I looted the item and have it in my bags. I turned it in to Marithra, but it just started the Amirdrassil campaign (I didn’t play season 3).

Do I need to complete this whole campaign before I can start the head enchant questline? Google seems to claim I don’t need to, but there isn’t a quest marker above her head to give her the Gnarlroot item.

I attempted to join a new raid group to see if she’s inside or right outside the raid, but she isn’t.