There's a time and place for everything >:3 you're the one who said they would be a tough nut to crack!

Her chakra control is already incredible, so instead of focusing only on her control he needs to work on her ability to react and move, which is why the constant ambushes were a thing. They'll need to build her strength in all areas of her body due to her frail physical stance at this time ( Need to prepare her for when Gai and Lee become involved in helping her ). What Kakashi excels in is his versatility; he has a balanced level of strength and his reflexes are nearly without peer against all but the highest level of opponents. His wide-range of jutsu and ability to strategize in the heat of battle is also something credible. If Sakura is to reach the highest level of shinobi, maybe she should start talking with him about who she'd like to be? Some shinobi emulate others in the past, maybe she looks up to someone and wants to be like them, and better?