Spoilers alert!
The force bond with Traya is a scum, she simply lied to you. The Jedi Masters dropped you hints of that throughout the game.
More spoilers....
The bond with Traya was another thing that suffered when Obsidian had to make cuts.
Originally, Master Vash was supposed to be alive (IIRC, she was on the droid planet, before that was cut, too) and she had some interesting information about Force bonds. Namely, that one way a bond could be broken is if one of the pair fell to the dark side. So Traya and the Exile did have a bond, but presumably it was severely weakened, possibly even severed, when she resumed her role as a Sith Lord.
I'm not sure how much I go for that theory, since it raises several irritating questions about both KOTOR games, but that's the explanation Obsidian gave. I do tend to believe that Traya strongly exaggerated the danger of the bond, but that's just my theory.
Vash's unused voice clips did ship with the game, so with the right tools and a little time it's possible to hear her conversations.
I will say this for K2--I thought the bond here was much improved over the bond with Bastila in the first game.