It's a fake.
Download the video to your desktop and then replay it using a SWF player with v8.0 Stop Frame Feature. You will notice that the shadows don't line up when the girl is in mid air in front of the backboard and there is an outline around the backboard. A very amateur type of “cut and past.� Furthermore, if she had hit the rim as the video suggests it would have caused an excessive discharge of blood from the blood vessels at the base of the cranium.
*Cue the image of blood collecting at the base of the skull*
No...the evidence says this was faked.
</Watches too much C.S.I. and needs hockey to return>