Its implied that before the chunin exams Kakashi mostly focused on general training with a heavy focus on teamwork. He trained them as a group and anything original to them was due to their own private training. Which to be fair it was implied he only had them for a couple of months. Kakashi was her jounin-sensei it was his job to train her in at least the basics and try to find out what she could specialize in to help out her team. Its is possible that he would have done more individual training if he had them longer.
The thing is how are they suppose to work as a team if they don't have a role?
Naruto: Shadow clone and his endurance make him a great forward scout and minion-tank.
Sasuke: Mid-Close range DPS.
Sakura didn't have any abilities till midway through the chunin exam where apparently Kakashi did train her in genjutsu. My guess is someone pointed out to Kishimoto that even among the girls she was the only one without any specials abilities outside of the default all learn at the academy. So, this was him addressing that. Then considered the mattered settled. Which is the problem of Kishimoto not kakashi as he never does the whole, "they must always be equal," obsession with her as he does with Naruto and Sasuke. Which leaves to her being constantly left in the dust, only given power ups when people point out how useless she was, and then after getting a power up Kishi considered it good enough.
Kishimoto does not seem to get the show not tell when it comes to sakura. Like with her seal like yes we know its strong with tsunade but we only see glimpses of it with sakura. She should of had a full on on fight with it