Focus more on the story, than the mechanics of the game. Don't worry about stuff like trip, disarm or sunder for a while. Make her character with her without offering too many decisions at first. I she wants to swing a sword make a fighter and choose her feets for her. No archtypes to start. She may never get to the point that she wants to make a character on her own, and that is perfectly fine. My youngest has gamed for 5 years now, and still wants to just tell me the character idea and have me worry about the details when creating a character. My middle child has taken an active interest and has absorbed everything in every book she can get hold of. Give her the opportunity to interact with the environment without putting her on the spot. Have a friend who tried to introduce his wife into gaming, but failed. He basically stressed her out with forcing her to roleplay too much too soon. Make the game fun first and foremost, too many DM's stress over the rules and forget the purpose of this hobby.