Kalista Under Turrets

My friend and I were playing a game, last game the turret would not hit Kalista even if she was the only one attacking me, I was on the back side of the turret and she dove me no problem. The turret kept hitting the minions instead of targeting her. Keep in mind I was right next to the tower too, also happened many other times in the game she could dive and not get focused by the tower. {{summoner:17}}