You have a good writing style, and it read smoothly. I liked your voice at first, it comes through strong. After reading a little though, she comes off as a bit of a brat. Work sucks, almost everyone 16 and older knows that, but we all have to suck it up, and that's what I wanted to tell your protagonist.
I get being impatient with the old woman on the phone, but her comments betrayed her age. In fact, reading that, I'd have thought you were younger, still in high school even (no offense). This might not hurt the book much if Ariel is forced to grow up in it, it could lead to a very powerful moment where she's face to face with that realization.
I want more context. On the setting-Nashville (unique, that's good), and that particular spot (safe area? bad area? touristy? business district?), and where her apartment is (my guess is not great). Also, on how vampires fit into that world. You don't need to give much away, but enough so I know what you're going for. Are they commonly accepted in the world, or something that she and few others know about?
And, if you ever want this published, you need a more distinctive hook. Vampires are done to death, agent and publishing house have full lists, they need something really impressive to accept it. Try brainstorming for just the craziest circumstances you can, and then pick a couple and make them realistic.
In the Anita Blake books, Laurel K. Hamilton had the Circus of the Damned, the vampires had nightclubs, and relied on good publicity, which was interesting, and had Anita is not just human, but an animator, and later necromancer. It's distinctive and fascinating. That's what you want to try for.
That being said, you do write well, and I hope you continue working on this.
Experience and a lot of how-to-write books and articles.