Considering Sakura doesn't have any super plot hax 9tails/super Hokage and magical chakra genetics from her parents/Edgy brain problem Uchiha stuff I think she's doing pretty well not to get blown away by the powerlevels released in a fart of one of her team mates.
Anyway, I don't think that Sakura punch in the last chapter was anywhere near full power though. Remember that seal grows when the user is expending more chakra.
It also woulsn't surprise me if she modified it, like Naruto did the Rasengan and Sasuke did Chidori.
I think there's also combat experience to consider. If Sakura had had even half of what Naruto and Sasuke have she'd be a lot more solid strategy wise.
Finally, I wonder which chakra nature she has. It would surprise me if that wasn't revealed in the coming chapters.