She's now buried in the flowerbed in front of our building.
I'm not skeeved so much as bummed (divinetailor, I remember your spider story). I've no clue where my boys even found a mouse. My best guess is from the pipe-access hole in the wall inside the bathroom closet. Wherever she came from, I certainly hope my boys don't make a habit out of this.
Bon voyage, little mousie.