I'm a girl who isn't very skilled at video games but enjoys them anyway.
For multiplayer, definitely the ones mentioned like Mario Party 8, you can also try Cooking Mama! Tamagotchi Party On is really bad, but who knows she might like it if she's 16 and not an experienced gamer I haven't tried EA Playground yet but that definitely seems like one that would be good for you guys to play together too. Also try Surf's Up.