Stop changing the manga,no one is born with perfect chakra control,abd Sakura spent alot of time training to become a Medic Ninja.Indra even posted the page of Tsunade mentioning how Sakura has been training for 3 months.
Lol,so much for getting everything on ger first try,and do not bash Sakura for choosing go take care if her young daughter while the world had been in peace for years.
Even sasuke told her to train in free time instead of loafing around.
The reason is, she doesnt has any unique style, something to remember.
And she has enough of time to do all of those thing.
edit. Maybe i remember femme no jutsu, but that is all...