Yes, you can.
I woudnt recommend Jahiera though, Aerie and Viconia are less buggy. Getting the Jaheria romance to work requires the baldurdash fixpack
(
http://members.rogers.com )
Anyway, back on topic. from what youve said I think you need to do the Xzar quest in the docks district next. Jaherias romance has a fair few quests to do, and a few things that can only happen whe you rest outside the city/