Well done
Nice ambiance going on. Try to find a better kick sample, something a little more round and bassy, this sounds a little too tappy.
The chord progression is really nice as it builds up. The way you mixed in the vocals is also pretty nice. Your sister is talented. However if you want to make it sound a little better, I think FL is coming out with that new vocal correction plugin, that could help to just even out the notes that are sustained in her voice.
The scratching sample is a little awkward to use repetitively, just since it sounds the same each time you use it. I think it'd sound nice if you just removed that. I'd also be a little more careful about the choice of that open hat thats in there a bit, its a little too trebly (Hard to tell you which one I'm talking about, its kinda rare in the track)
I'd also really enjoy if there was a hit or drop that led into a soaring climactic section, with just harder chords and a harder kick, just so theres kindof a buildup and resolution in the song.
Anyways its a very well composed track. I hope to hear more from you:)