I've nearly finished the game. I just killed the Ravager, and Aerie will inch in my direction, her music will start, and her circle around her character model grows and shrinks, like when an NPC starts talking to you.
But nothing happens. She only inches forward and stops, like she's bugging out. I tried resting too, didn't do anything. I've even got enough hours of playtime in for her pregnancy timer to time out before fighting the Ravager.