Set your partner up to play in the starting area of the game. Most games have a tutorial that will walk new players through the zone, and teach them how to play and use the interface. It is important that you do not step in and tell her how to play. You do not want to make her angry at this point. Let her play through on her own, unless she requests your help. Remember, to get her hooked, you want this to be a positive experience. In fact, just walk away. Most veteran gamers can't help to push in their opinion. At this point, if the game fits the personality, the new player will be hooked. If not, you may want to try a different game, or find a new hobby.