....but combat sense does not actually give you armour, it only adds to your base defence which is still a random chance you don't get hit. whereas armour itself is a constant value. Again, having good armour can mean the difference between taking physical or stun damage. Stun damage is easier to mitigate (faster recovery and one can also use a stim patch if necessary) than physical damage.
Also, the character already has 2 levels of Combat sense as well as two levels of Mystic armour. The only other way she could improve her armour would be to burn out a power point for something like Orthoskin, Bone Lacing, or Smartskin as she has the best combination of armour a character can get at chargen (Jacket, Ballistic Mask, and PPP legs and arms protection for a total armour 18 with the Mystic Armour).
My Face, who is not a combat oriented character, has 20 Armour.