Managed to download the files here, thanks for uploading them.
One thing I noticed is that the lighting changes quite drastically during the course of the clip, from warm oranges to cool blues. This might be due to light from nearby windows changing as the sun went behind clouds, or due to the studio lights being changed, or due to the camera constantly re-evaluating the white balance. You might want to look into the possible cause(s).
There does seem to be a lot of colour spill in the original. If you look at the edges of the girl's top, you can see a lot of green spill just with the naked eye. From the looks of things she was seated very close to the greenscreen, so the best recommendation would be to move her further away. This is particularly important if you're filming on a low resolution NTSC camera, where colours can blur together.
Other than getting some more distance, though, your greenscreen looks excellent. So my main recommendations would be to put more distance between your subject and your greenscreen and find out what's causing the lighting fluctuations.
Here's an example composite I threw together:http://tarn.fxhome.com/cazgexample1.png
I used a sharpen key grade filter, then an auto color difference key (with user grey raised to 0.33), then spill suppression. Afterwards I threw on a few grading filters to blend the layers together a bit.