I'm going to step out here and say something about the type of friendships these are. These kids are cohorts in crime. Literally. They spend their time flying beneath the radar trying to illegally buy alcohol and drugs, or buy it legally and give it or sell it to those who can't. And then they drink together and prowl the streets and bars until the wee hours. That's what they do.
When you've got a group like this, they're not really friends. They're accomplices. Now that one of them has caused the bright glaring light of the public on their behaviors, they're a bit scared and a bit irritated. As well, I'm sure they do have some affection for her and some strong sense of loss. But they're also covering their criminal behavior and hoping not to get charged for it.
Except some, like JW and Mike B who weren't in on this whole thing.
I contrast their social network with strongly religious youth I know - who spend their time bowling until the late night, sitting on the beach in front of a campfire, having game nights with Trivial Pursuit and Charades, all stone cold sober. If one of their crowd went missing walking home from these events, they'd rally and hold vigils and do what they can - anything - to help out. Because that's what they're made of, that's what their friendships are forged with. Love, affection, connectedness beyond using one another for mutual criminal and drugging/boozing activities.