You kidding right?
She choose Naruto in the Kage summit arc. We saw just how strong her love for Naruto is. She would rather lose Naruto as a friend and take all the hate upon herself just so Naruto wouldn't be alone anymore. That he'll still have his friends. Not to mention she was willing to kill the "love" of her life just to keep Naruto safe.
Now I'm sorry but if that doesn't show us, that Sakura's love for Naruto is stronger than her love for Sasuke. Well nothing will.
While I hate to play devil's advocate, Sakura hesitated and was unable to kill him. It was the fact that she wavered in her resolve to kill Sasuke that makes it a not-as-great-as-it-could-have-been moment to show that she chose Naruto over him.