afaik most boss fights have an autosave on initialization.
when she talk you can at any point in the conversation:
-examine her with other party members
Yeah, examine her, observe that she has -50% cold resistance, memorize spells accordingly, enter fight, she gains +100% cold resistance for a total of 50% and immunity to Frozen. Don't use elemental spells, you say? Well OK, guess it was pointless examining her; my options are even more limited than they already were, and is more evidence that elemental attacks are vastly weaker than physical, as if we needed any.
-move other party members (including running away)
-teleport her away
Those are cheesy out of combat options to perform in dialogue, unless Larian intended it as a nod towards the infinite dialogue exploits in BG2 where you could initiate dialogue with Lichs and then kill them as they stood there expecting to have a conversation. I expect you were also an advocate for stealing Kangaxx's ring twice, since not many people seem to object to thieving their way to victory in Original Sin 2.
Getting 1-shot by a side-boss who hits massively above her level and suddenly plugs her only elemental resistance hole for no apparent reason is MMO Raid nonsense. It's beyond MMO Raid nonsense and into trolling territory.
1000-1500 damage with an AOE spell is enough to be dishing out at that level, not 5000 or whatever it is.
