I've noticed with my lf zon that I'm not dodging ****. I've got 1 into d/a/e and with +skills they're all hovering around 60%. Now, that would normally be far more then enough but I notice that everything that goes towards me is either blocked or is a hit. d/a/e isn't doing anything! Does the animation simply not work sometimes?
Go off the sound effects. Every time your zon dodges she grunts.
As a guess it may have more to do with your computer than the game. I first decided to make all passive zons after seeing one dance in a Hydra, but after thousands of hours with maxed d/a/e I have never seen my own zons do this but I also have an old low spec computer which is well above spec for the game but less that great for online play.
Also if you are using Fort the Chilling Armour is counted before Block or Avoid. Even with maxed Avoid you will only be dodging the arrows etc that get through the Fort and shield.