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How do I get Bohdi to bight Jaheria and turn her into a vamp ? Also how do I kill Bohdi ? I got her to near death but she wouldnt die.

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A Council Member of the Wizards of the Light

Are you in the "cellar" of Bodhi's lair? There are a number of times in the game where Bodhi is unkillable, the final fight takes place in the rooms down the stairs of her lair. She will only turn Jaheira (Aerie, Viconia, Anomen) into a vampire if you are having a romance with her/him, and if the romance is in the right progression stage.

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Melusine, Archbabe of the OHF and the LH
http://www.angelfire.com/anime2/memnoch/mel1.gif
Your voice is ambrosia

Yeah I am in the little cellar thing. I just useded the holy water. How do I get the romance to the right point ?

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A Council Member of the Wizards of the Light

I'm not sure...I do know that Bodhi at one point will flee into a little chamber on that same floor, and it's only there that you can kill her and the vampire thing takes place. Maybe if you have her surrounded she cannot flee and therefore you are stuck...try and see if she flees if you give her the chance.

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Melusine, Archbabe of the OHF and the LH
http://www.angelfire.com/anime2/memnoch/mel1.gif
Your voice is ambrosia

On the romance thing you need to be at the right stage.
On the not dying thing, do you by any chance have immune to undead on you? If you do she won't initiate the dialogue where she runs away.