Sakura would've been stomped immediately w/o Chiyo because she wouldn't know the traps and movements of his puppets in the initial stages. Plus the antidote was luck/bs or however you want to see it. Other then that cure you can't really take much of Sakura's battle prowess from that fight. Her slow reaction to the Cloud nins in recent chapters is more telling of where she's at.
He said Chiyo was needed.
All your reply is, is a repeat of what he said.
And her 'slow' reaction proves nothing, it was only to either set up the fight between that Cloud nin. girl and Sakura, or just to give her the chance of saying "God you're so
annoying! What is Sasuke to you anyway?"
That's how a story comes together. It needs to have moments like that to make sense, and give a character development.
Sakura is one of the few characters who didn't use a stolen power like the curse mark, or granted power like the Kyuubi. She actually strived on her own.
That adds to her strength all on its own.