It's alright, though not publishable. I'm going to continue by assuming you do intend to be a published writer. I would also assume that this isn't a draught, but your finished intro? M'kay, so...
Your first problem, like many others, is that you're telling us what happens rather than showing us. At the moment, you're kind of reciting a story, as if it were some memory.. this isn't a good thing. It builds a vague 2D image in our minds, and we can't picture clearly or feel anything. Instead, you should be creating a vivid image.
Take a look at this;
"The body fell back on top of me while I was still screaming"
You're telling me this. I want to feel it. I would change this to;
"The body strained my chest as it fell on me. Still I screamed, as blood trickled across me."
O_o
Break the story down in to snipets. For every point something changes, it's a snipet. Describe what has changed, through the feeling of your character.
Anyway, a few further points. The first thing she would acknowledge would be the woman waking her up. Perhaps you should describe the woman first, and then explain that as the girls vision clears she sees the plant pot?
Pure white is just white. It's best to leave it at that. If you wanted to emphasise that the room was empty, or that the entirety of the room is white, perhaps you should rephrase this sentence to note how bare the room is.
Apart from that, I think you have a good imagination, and I'm fairly certain you could keep going and enhance your skills incredibly. At the moment it's just a matter of practising writing.
Now, you may have read through my answer thinking 'well everyone else liked it'. Yes, I'm genuinly sure that they do. However, I'm pointing out what needs to change before this piece can be considered publishable. The people who like it don't represent the thousands who could potentially read this, and the point I've made are based on what publishers think the average reader would prefer.
Anywho, best wishes =)