it's pretty obvious she made it up, almost all fat black women claiming stuff like that make it up. lets consider the alleged act...4 white guys, right there it's highly unlikely because crazy people cant recruit anyone to join their plots, let alone 3 more. They also did it from a car, gee, that's risky, all you need is a description of the car with a partial license and they're fucked.
Then they squirted it from a car through another cars window, that;s pretty hard, then they threw a lighter too, again very, very difficult, especially when almost all lighters would go out once you let go. Finally a flammable liquid would run down her face, wouldn't it? it would be a splothch with a drip pattern, not these widely spaced semi burn marks. Then you have the fact that her face was on fire but that massive head of frizzy hair didn't catch huh?
There's not even a 1 in 1000 chance this is real.