Not Updated For Current Season
The masteries shown here are not yet updated for the current season, the guide author needs to set up the new masteries. As such, they will be different than the masteries you see in-game.
This build is from the riotgames build on youtube. I built it here for easier reference. you can get more game play details if you go to there page on you tube searching riotgamesinc.
the last two items I have listed for her are alternates to her more carry 2nd and 3rd items incase your not carring.