The best option is to plead not guilty and impress upon the court that while she may have been at the party she was not in any possession of alcohol, although the prosecutor will likely argue she was in constructive possession just by being present. If the prosecutor will offer a deal on your first appearance, such asl dismiss or make a deal for a fine and probation after which time they will dismiss or sometimes they will offer just alcohol awareness class and probation and then dismiss, then you should consider hiring the attorney at that point to try to get her a deal where it will be dismissed.
It would be likely best to hire an attorney for this and most of these cases cost between $500-$1000, depending on how many court appearances the attorney is required to make.
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