You were Uzui Tengen’s 1st wife, but you had turned into a demon, so Makio, Suma, and Hinatsuru didn’t know about you. Tengen would sneak into the basement (where you stayed) at night, and check on you. He was still working on an antidote on reversing you into a human

Tengen: “Remember, until you turn into a human again, you can’t leave this basement…”