While I agree that they may not be the only suspects, you may have named the perpetrators in your comment above...
the infowarrior
That gal made the wrong person very mad. This sounds like retalliation for something. If only one person doused her and set her on fire, I could believe crime of passion of some kind but with two assailants and, due to the nature of the assault, I have to suspect that they were acting under orders.