I think Jaheiras romance kicks in when you pick her back up from the Harper hold, after she leaves you a note. It takes ages for her romance (there are some intermitent bugs attached to it as i understand) to kick in full swing, ie bed her. I still haven't after the underdark but I know the romance is still active. Fortunately shes gullible and allowed me to sleep with the underdark woman. It was my plan to sleep with all the women in the game (sorry girls, my blokes a womaniser

) but alas Aerie escaped. Once Jaheira submits she'll be dumped and its onto Viconia.
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It's bleedin dark down here, slippery too.

Man, that's a pisser.