If I were you, I think I would give up on Sanctuary for now. If your problem is just timing, or that it's a challenging one to write, then your mind will probably return to the story again and again, and soon enough you'll be excited to work on it some more. And if you never get excited about it again, then it's probably not a good book to force yourself through.

It sucks that writing is being hard for you right now. Everyone goes through those periods though--you'll be through it soon enough. :)

P.S. Did you see Seanan McGuire's brief call for trans superheroes in her post about the Genreville post you posted (...too many "posts" in that sentence)? The relevant passage, in case you missed it:
I want books that are sold as being normal, everyday, perfectly ordinary books, that just happen to have gay people in them, not the next! Big! QUEER ADVENTUUUUUUUUURE! I have plenty of queer adventures. What I want is gay men doing laundry, lesbians chasing werewolves, and transgender superheroes fighting to save Metro City. What I want is books where the story matters more than the sexual orientation of the characters it contains.
I read that and was all, "adfklkj Lauren has one of those books! :D"