It's only logical to question this under the circumstances!considering what she's drawn before, how she acts, and now the move to Portland, are we sure she is even a she?
However, Sigil is by all accounts a biological female. Backing that up is, IIRC, her marriage predating when you could do that legally. I do believe she is into some kind of translite 'enby' stuff, but it's been literally years since she was popcorn fodder for me, so I'm not up to date.
