As you all know, as you put more points in Shadow Master there is an improvement of your items as the skill gets stronger. At level 1 she uses superior normal items while at level 6 she already uses many magic items. At level 11 she already uses several rare items.
My suggestion would be for Shadow Master to have a visible inventory of these items for the player to read just what she is wearing, just like with mercenaries. This would allow the player to choose which Shadow Master’s best spellcasting to do to best help him due to the properties of the items she uses being random.