I honestly don't see how she's a ninja, she never trains. If I were her, even if I were completely lazy, I would train to know at least a couple of jutsu beyond the basics, because I'd be going on missions with Sasuke (cuz I'm so totally obsessed with his nuts) and they tend to be dangerous. Since I'm a lecherous bitch, I'd just rely on him to protect me for the most part, but in the even he proves useless (i.e. dies) I'd like to have a couple of tricks up my sleeves to make sure I survive, including a running away jutsu. This is basic for any user. Sakura's the dumbest character in the series.