Long story short, Aerie has been kidnapped by Bodhi and turned into a vampire, so I had to kill and revive her. When she disappeared, she was wearing the Robe of Vecna and carrying the Bag of Holding with most of my goodies, but when I revive her, her inventory is empty. How can I get my things back?
Before killing and reviving Aerie, you should check the spot at the graveyard where you first meet Bodhi. At least according to this post. Alternatively don't give her all those items in the first place.