>It's possible that she's wandered farther afield, in a multiversal
>sense, than the UF universe will, and that anything she mentions here
>is not simply an alternate universe, but several sheaves of universes
>away, and doesn't actually exist in the sheaf that contains UF.
>
>Heck, for all I know, what she calls the Logrus is actually Eris's
>garden maze.

Random headcanon if it turns out to be closer to home than that: The Logrus is what the Time Lords refer to as the Temporal Vortex.