Lets be honest.
The crazy motherfucker they sent her to buy drugs from was obviously nuts, right?
Well lets look at the situation had she not been killed
She leaves the house and goes to the cops, she will be the last customer the dealer had.
She brings the drugs to the cops, they call in the drug team they had waiting to bus into his house.
(Because cops are stupid and they, like everyone else, have no respect for snitches, as soon as the snitch goes in, the cops raid as soon as they make the buy, instead of waiting to let the dealer wonder who it was for a few minuites)
The cops talk to the dealer, try to get him to flip on his supplier so he doesn't get charged.
The dealer, full of rage, and looking at hard time, still knows its better to be in jail then be dead.
The dealer goes to jail, gets a harsher sentence for not snitching (it happens)
The dealer arranges for the girl who set him up to get killed.
And not simple gunshot like he did, this man will be locked in a box so some little tramp can get off free on a small pot charge
He will arrange for some sadistic fucks to torture her and make her suffer to send a message (Usually when snitches get killed, they get killed in fucked ways, at least around here, to send a strong message as to what happens to snitches, I.E. Arms, legs chopped off then stabbed, beaten to death with a bat, hacked to death with machete, i've heard of all of these things happening and many more terrible gruesome ways)
Moral of the story;
She'd be killed either way, I know it, you know it, we all know it, the only way she could live is if she moved away and never came back, but sadly, if she flipped on someone as crazy as her dealer, she's not smart enough to know to hide, she's probably one of those people who thought "Okay, we'll I'm just going to go in, buy a bunch of drugs for the cops, bring them to the cops, he'll get arrested, and I'll be able to get along with my life like it never happened"
That's what stupid snitches do (Shit, even when I was in high school and some kid got busted with a five nugget or gram of weed and ratted on his little dealer (hustling' a hardcore 1/4oz a day, lol) they still got the shit knocked right out of them, especially the preppy kids like jocks and American Eagle fags who were so afraid of a criminal record they'd rat out there pot dealer BECAUSE THERE PARENT FOUND A BAGGY IN THERE BOOKBAG [It Happened, and more then once, in under 4 years] and emo kids, who wanted to act so hardcore getting stoned and doing e, that they felt so hardcore, only to have there world shatter when they get busted, and become so scared they'd rat out there own mother just to make the situation end)
there is the matter of betrayal of trust between dealer and client, but I think just knowing you got snitched on so someone could save there own ass, while landing you with more charges, would drive some people over the edge.