Theres still some things that I dont understand. Why did Noel kill Theresa if Theresa was secretly studying Dhampirs as a means of defense against the inevitable war between the pure bloods and the church? As a true blood, wouldnt Noel approve of this considering that Noel wants to end the deal between the church and the pure bloods as well? Shouldn't they have been collaborating considering they have the same motive? I feel like this whole thing has a lot of plot holes.
She had (and still has) no knowledge of the church's motivations, though - these were only revealed to Dorothy after Noel had left. As far as she knows the deal still stands and the research could have been meant to be used against her instead. Not to mention, we don't actually know how much we can trust either side's words in this.