To play devils advocate...
Alright, correlating Video Games with Violence and antisocial tendencies is BS. I have a Bachelors in Psychology, ive read the research, the complete illegitimacy of the claim is pretty basic Psych 101 stuff. Anyone who actually did a study that has any validity at all would be, and should be, arrested. Any mature individual can play a game of any theme with out negative consequence, or at least consequences comparable to watching movies, playing sports, etc. The mom here is obviously either a failure as a mother, or looking for a scapegoat for this tragedy. I am willing to have pity on her if she needs a scapegoat, because my heart does go out to her, and as a video gamer I can forgive the irrational outburst of someone who has just lost there daughter. However, I don't think that children should be exposed to very violent video games, and that the ESRB is there for a reason. So I will grant this women that it is not impossible (Though it is improbable) that playing this game was a small factor, amongst many other factors, that lead to her daughter being desensitized to a culture that encourages drug use, which in turn has a small chance to leading to encourage experimenting with drugs, as countless children already do. And although other environmental factors are by far more likely the cause, I think the issue of children being able to play a handful of Mature games via Cell Phone without an ESRB-like system to intervene is an issue worth addressing. So yes, Video Games on the platform of cell phones alone seem to be an issue worth addressing, after you look at half a million other factors that are actually worth addressing for the sake of her daughter. Point granted. Now go look at your school, law enforcement, friends, family, counselors, her mental state, yourself, and pretty much everything else in her life before it's worth addressing a game.