It doesn't matter if you're on the dark side, you also get the romance, although I don't know if you can tell her that you love her on the star forge, but I'm not even to the Unknown Planet on my dark quest, so all I know is that you can kiss her.
I didn't make it!
well you dont go with her to the dark side on top of the rakatan temple if thats what youre asking. well, go with her if you play ds, but ls, dont. you can still romance, but not on the rakatan temple.