Nah, "impossible" is just an obstacle to overcome.
She's the one who's going to be cowering to avoid provoking my and my companions' ire. We are D&D heroes, and we are going to assail her world so hard, she'll change her name to "The Lady of I-never-knew-such-pain-existed-before-I-was-smacked-down-by-the-new-Lords-of-Sigil".
Nah...it just shows how beaten down this generation of players and DMs are. In the Astral Sea, I can climb the color lavender. When I'm in charge of D&D, every self-respecting player will boast of how they kicked the tar out of the Lady of Pain and every other overgod.