Act 3? The game bugged out in act 1 when Shadowheart tried to kill Lae’zel. It straight up didn’t show us the cut screen of them fighting, and defaulted to Lae’zel dying when we failed to stop it in a cutscene we didn’t get.
The end result being that Lae’zel just didn’t interact with the party for a month, and then suddenly drop dead, bloody on the floor after a patch.