I finished the game, the final battle was over before I even finished looking over Areelu's stats sheet. She teleported in the midst of my party, took a beating and then died from attacks of opportunity when she tried casting a spell.
Every Larian game I've played has an impressive opening part then falls apart completely as the game progresses. This is very apparent in Divinity: Original Sin but also exists in Divine Divinity and Divinity 2.