In my game the Had ran to her lair, I worked my way down there and had a cutscene where she talked about fighting her in her lair and using my blood to spice her stew. After the cutscene combat never initiated and I just started peppering her with Eldritch Blast-- she never attacked me back, combat never started and I was able to kill her, easy peezy lemon squeezy.
Easiest 250xp i've made in the game :P
