quick hands will always trump a defence player for they need to actions to occur, feet then hands before they can defend a pass.  the best way to defend that is to see where the pass is next going to be headed and try for the intercept.

as for tipping vs catching, make sure the player is going up for the rebound or intercept with 2 hands, with the intent to catch.  not all rebounds or intercepts are catchable.  you can also do the drill where the defence sets up on a side on defence position and have the attacker and feeder facing one another, and the defence player has to come around and catch the pass not just use the outside arm to tip it.  make sure her feet come all the way around the player.  if they are just not focussing on catching and taking the easier option of tipping, then make a game out of rebounds/intercepts between 2 defence players.  so set up the circle with 2 defence vs 2 attackers with the other players on the outside.  1 point for a tip, 2 points for an intercept or rebound.  person who wins gets to choose the punishment for the other. or whatever you think will motivate your players. continue this game in a game situation, and log tips vs intercepts/rebounds.

hope that helps.