Loesr

Confirmed - ran into the bug after replaying the quest using multiple dialog options, increasing stats via consumable/respec to use optional conversation lines, no change. Regardless of the path chosen, if you do not commit violence when stealing the banners and return, she will mention that you already have the loot and not give you the key to open the chest. If you go hostile, you can loot her corpse for the key, then open the chest.