Now as to why Meetra would have been on her way back into the galaxy in the first place
Carth Onasi called her back to Telos in order to find out more about Revan.
Atris acts as if she didn't have anything to do with the return of the Exile. SHE was the one who publicized the return of the Exile into known space in order to draw out the Sith. But when we tell her that we encountered the Sith she acts as if she doesn't know anything because if she would have admitted it, the destruction of Peragus would be HER FAULT.