She literally rejects every poly proposal in act 2. All 5 options. Thats not headcanon. Headcanon here is only that you assume she rejects it ONLY because she feels threatened to not be first in Tav's heart. Karlach for example is doomed and SH herself shows attraction to her in act 1. All you have for "poly" evidence is her tiefling party line, where in order to make her say it - you have to play dumb, and make weird, not obvious interpretation there.
