Although what happened sucks, maybe she should be less concerned about what beer did to her kid and more about how SHE could have prevented it. Alcohol companies do usually have disclaimers about underage drinking (drinking and driving, drink responsibly, etc.) and they cannot control what happens to people who do choose to drink or how old they are. If he was drinking another brand of beer, it still would have happened. Maybe instead of suing Coors, she should sue the people who actually gave him the beer to drink at the party.
H-D