I'm interested in how Elizabeth Bartley can be Dracula's niece. What, Mathias turn his brother into a vampire too? Did he even HAVE a brother?
Or Mathias had a sister(who married a man with the surname of Bartley, and had Elizabeth as her daughter.
My little fanfic idea of what I think happened(taking LoI into consideration) was that, yes, Mathias had a sister who bore Elizabeth, and that Mathias was close to Elizabeth(before LoI and his Elisabetha's death), and Elizabeth loved her uncle dearly. Everytime he'd visit her, he'd spoil her with gifts. That maybe, by the time of LoI, she's a teenager. After LoI, years later, Mathias, now a vampire, vists his neice, who's now a beautiful woman, and seeks shelter in her castle. She, like Mathias, practices the dark arts(she hails from a bloodline of alchemists, afterall, and learned a few tricks from her mother). While Mathias is there, he turns her into a vampire(bestowing eternal life upon his favorite niece as his most precious gift to her). She revels in her new power, and starts her reign as Blood Countess.