Can your teen build websites? Help set up or fix someone’s computer? Is she hyper-organized or a number-cruncher? Can she knit booties? Teach a language? Online, few folks care about age when dealing with someone who has a skill that they can do well. If your teen has skills to market through friends, family or even Facebook, help her work her connections and turn that talent into cash. Advise her on what to charge, and pass on any potential "clients" that give you bad vibes.