I figured this out. When Bodhi vampifies Jaheira in the graveyard entrance, Jaheira remains in the area as a vampire and joins the rest of the vampires. In my original playthrough, I killed this vampire Jaheira with the rest of the vampire party. It turns out that this Jaheira in-game "object" is the same Jaheira "object" that you get after you perform the ritual, and since I killed it in the graveyard, after the ritual I got it in a dead state. On my next attempt, I tried to just run away from her and go straight for the catacombs. This time, once I tried to resurrect Jaheira in the temple of Amanuator, an enemy Jaheira appeared (again- retaining the state it had in the graveyard), but since her restoration dialogue was immediately initiated, I got her to rejoin the party as an ally.