Well, frankly speaking, saying that the difficulty slider is your option of making the fight easier is not a worthy reason at all IMHO.
Sorry for taking so long to make this reply, Hank, but I had university stuff I had to take care of (including a paper and two tests which I hope I passed for.. I just found out I failed one of the tests I made before summer break..
).
Anyways: look at who Bodhi is. We meet Jonoleth Irenicus and his sister Bodhi. AFter trying to steal the essence of the Tree of Life, both elves are to be banished from Suldanesselar facing the gravest punishment of all: they are to be left soulless. Bodhi finds a way to fill that gap by becoming a vampire, nothing more nothing less.
This means that she shouldn't have any special vampiric powers! Storywise, Bodhi is just another elven vampire! Her brother, Jonoleth Irenicus walks another path to fill the aching gap within his body. As a potent mage already (which Bodhi is NOT!) in his elven time, he increases his power, and sets up a plan to once again try and devour the essence of the Tree of Life. For that, he needs a soul, and for a power-hungry elf like Irenicus, that means a potent soul, a strong soul. So who does he choose? He chooses the protagonist of our story because he has Bhaal-essence in him. And why is Irenicus so powerful with this soul?
Because he was a 29th level archmage already! Nothing new for you, I hope.
So what are we facing after Spellhold? We've got an elven archmage called Jon Irenicus who has the soul from of a Bhaalspawn, a truly worthy opponent, and we've got an elven vampiress, also with the soul of a Bhaalspawn (courtesy of lovely Imoen). This gives SOME room for Weimer to make both Irenicus and Bodhi more difficult than they were (yes, they were easy in the original game). It does not, however, mean that Bodhi should become a manslaughtering, one-woman killing machine. Because that's what Weimer has turned her into!!
Bhaal essence does not give you super-anti-vampiric powers! For christ's sake, Bodhi owns the powers for like maybe one and a half weeks! It took the player years to control his powers, let alone attain special powers like the ones in the special ability button.
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In short: Bodhi may be a vampire boss, there is no justification for her to have any SPECIAL powers. If Weimer wants Bodhi to be harder, he should have done a different thing to her than give her weird powers such as Cloud of Bats. Make her turn into a bat when she gets injured for instance, make her send in minions when the going gets tough. Why not make it several encounters in the vampire lair instead of one? Weaken the player a couple of times before the final show-down.
Just my two cents, but I think this encounter can be way better.