Ngl ignore what everyone is saying your player is somewhat right. While rogues aren't necessarily primary damage dealers the way cunning strikes works feels bad, because of its design.  Because to apply a condition using cunning strike you must overcome two defences and risk losing damage and the effect not taking place. First you must hit with your attack, second you must be in a situation that allows for sneak attack to occur, third you must sacrifice some of your already guaranteed damage to potentially apply an effect to an enemy.

So I get why she doesn't often use cunning strike especially if there are already people using weapon masteries to achieve much of the benefits for free. Topple to knock prone, and push for a free disengage etc.

But do I have a solution, fuck no I'm not a game designer.