You are a fantastic writer! I'm not into twilight as much as I used to be, but this story is just fantastic. I love all the detail and the plot! I can't wait to read more!! :)
My first comment would be: THIS CHAPTER IS TOO SHORT! You should make your chapters a bit longer. Try to add a description of Anna, because I can't visualize her at all. I have a pretty weak imagination. :))
Oh, and your plotline seems very interesting. And I like Anna's name. It makes her appear very innocent.
You should try deepening this chapter more. It'll make it longer and more interesting for the general reader. My suggestion would be to frame Anna's emotions regarding the death of her mother in words so you could communicate to the reader her grief. It'll be better if you make the reader feel those emotions, because then they could actually care for Anna. A good story should be able to make the reader care for your character.
I further suggest that you read out your draft to yourself so you could root out tiny grammar mistakes and typos so the reader wouldn't be distracted by them. It's actually a bit annoying to be reading the story in suspense and then a typo appears out of nowhere. You could also ask someone to check grammar and technical stuff for you.
Oh yeah, and your summary of Alice dying actually gives the whole story away. It's too predictable now. Oh, and try to at least put Anna's background in the first chapter. If you don't wanna let your readers know yet, then put it in a way such that it seems very mysterious and that will get your readers thinking and hoping to read more. I'd suggest putting that in her thoughts while walking and before meeting ________ (if anyone still doesn't know who the driver is and is reading the comment). That'll make her more startled when he honks his car.
One last thing. Your scenes actually don't make any impact on the reader. I actually found the scene wherein Anna tries to escape her dad bland. It's too... contrived. Try a more creative approach to it so it wouldn't be boring.
Also, your plotline moves too fast. I'd suggest postponing their meeting until another chapter or making the chapter longer with more scenes.
I promise this would REALLY REALLY be the last thing. There are sentences in the story in which you mention something already obvious, like when she knew that she is going to school. You could've just said that she "lost" the battle with her dad. No need to mention that she's going to school. We already know that.
Anyway, I'll read through this again sometime since I'm a bit busy now, and this is all I can say for now. Feel free to ask me any questions if you have some, or if you wanna clarify things. And I hope you'll edit this out and replace this chapter with a better opening, since most people I critique on offer lame excuses why their writing is like that and just leave it there like that without changing it at all. I mean, why ask for criticism when they wouldn't even take it? Ooops. I ranted too much. Sorry to keep you like this. And I hope I helped you.
Keep writing and practicing! I shall be looking forward to more of your work. :)