Sadly, I was not impressed at all with that video. Like has been mentioned, cutting her into the Spears video didn't come off well at all. The lyrics didn't really seem to match the character she presented visually
at all. It just rubbed me the wrong way in every way.
However, I checked out her other two songs. Those were a hit and a miss with me. I liked It's Impossible. She rapped really well there; she had a great flow going there. I wasn't all that impressed with Dyin To Be Down, though (although I love the beat...The Game, and especially Lil' Wayne, do that beat a
lot more justice, however...that's despite Lil' Wayne's rap being recycled from another of his songs; it just sounds better on that beat. But that's beyond the point). Like was mentioned, the purpose and her credentials are a complete mystery. Why does she rap about what she does? What was her life like? What'd she go through?
Escalating the problem, she doesn't have the "desperate" sound that a lot of the rappers who rap about the same thing have. Taking the Game/Lil' Wayne song "My Life", for example, you can really feel from their voice the struggle that they're portraying in their lyrics. Even if you couldn't understand English, just from how they sound, you can get a feel for what they're rapping about. It's a struggle. With that girl, it feels very forced and fake.
If she is truly justified in rapping about what she does (i.e., had a very tough life, grew up on the street, etc), then I hope she can get the proper help in portraying that a little bit better. If not, maybe she should rap about something a little more...real. It doesn't take away from the person as a rapper; it adds credentials, since she'd be rapping about something that's actually from her life, about reality, instead of a fantasy world. Take Asher Roth for example (and he's from the Philly area, too)...his first single was about college life (and oh how accurate it was, at least for my university, heh). He doesn't fall into the trap of emulating all the other rappers out there...he created his own style, and rapped about what he knows about. He's a white kid who went to college...it'd be silly for him to rap about a tough life, guns, and hoes (well, that last one...he DID go to college, sooo...haha). And look at him, he's doing wonderful, because he is being himself and it shows.
Anyway, just some things to think about. I wish all the best for your friend.