If she just talked about her sister then you have one more dialogue tier to go through before the quest will start. Once she talks the next time make sure to head back to Dantooine. You need to do the quest before you go to the Leviathan if you want to get the XP/rewards.
Just making a quick note that the v1.01 patch was just released. Check the first post for a link.
Last edited by InyriForge; 01-29-2008 at 08:26 PM.