Had to think about that a lot for my Nar Shaddaa Rewrite mod (currently on hold since I'm working on modding tools).
I don't think I managed to come up with a good answer. For the light side scenario, I was changing it to the alternative scenario where the Exile and Mira both believe that Visquis holds Zez-Kai Ell. The Exile obviously has to go to save him, all Mira does is warn him of Visquis and make a deal to take them both to G0-T0 with "no pain, no fuss" after they're done in the JJT. Then I have Mira discover that Ell isn't being held by Visquis, so she follows the Exile into the JJT. But that's my interpretation, only the bold part is the original scenario that we have VOs for.
She would still do that for the DS scenario though, and I don't have a good answer to that either. Yet (hopefully).
But there's way more nonsense in that part of the story. Like, in the LS scenario, Hanharr will claim that he brought the Jedi to the JJT (like in DS), but he didn't do anything at all actually. It's stuff like that that made my go into making that mod, along with clearing the base for the GenoHaradan.