No way that's her on the tape. Five gets you ten it's her supposedly best friend in the wig, and that it was meant to be put out to demean her. Probably she had a falling out with the friend, boyfriend and junkie dealer kid, and that was to be their payback. She finds out, freaks out, goes off with the real killer. That's my guess anyway. So far I'm finding the show engaging enough, though certain plot contrivances are bugging me.
First, the whole leak about the campaign car: how has The Rocketeer and his team been so stupid to not use that to their advantage. All you do is say: "One of our cars was stolen, we reported it as such at the time, no further connection. The reason we didn't come out with this ourselves is because the police asked us not too and we didn't want to put politics in front of justice for a young girl. You know who did want to put politics in front of justice for a young girl? You vultures in the media/my opponent, who leaked the information in the first place, thus giving the killer a leg up."
Of course, that would be too logical and thus cut down on easy (but nonetheless boring) conflict.
Also, your classmate has just been announced murdered and you're watching footage of her being raped on your cellphone in class? Come on. The fear-mongering portrayal of teens in this is really eye-rolling.
Honestly, the more I think about it, the more this is starting to come off like The Walking Dead. Types instead of well rounded characters, rote twists, and conflict that stretches credulity. So far there hasn't been much in the way awful racist caricature at least (although the Hispanic peadophile cluing the detective in with a spooky Spanish word that everyone recognizes comes close). I plan to follow through to the end of this season at least, just cause once I start watching a murder mystery I'm compelled enough to see it through to the reveal, but much like Walking Dead (and occasionally Mad Men) I think critics are confusing quality production value with quality storytelling.
PS. For whatever it's worth - I'm calling the high-school teacher as the killer at this point. Or the main detective's fiance. Probably the teacher though.