Yeah I don't think sakura was trying to manipulate naruto here with his feelings, given how angry she got when he accused her of lying.
I was not saying that she was lying.
Giving a confession does mean something, even if it was not given with the intention of getting close to the person you like (which was obvious). She was probably very suprised that he refused her.
Sakura could've just admittet that she still cares deeply for Sasuke and wants him to be saved, but that she is not a child anymore and Naruto now means more to her than Sasuke ever had instead of just pretend that she's completly cold now. Sakura was (for whatever reason) still in love with Sasuke, and after all her efforts to hide this from Naruto and most likely also herself (she was planning on killing him! You can't do that to someone you love!) Naruto still saw right through her.
He "hit" her where it hurt and Sakura responded with anger, which is quite understandable.
It is also not likely that the feelings Sakura confessed to Naruto in this stage were more than platonic love, IF they were still planning on going with NS while writing this scene, which I highly doubt. There were a lot of scenes that hinted Sakuras' heart yearns for more than that in the future, but up to that point she has never thought/adressed/confronted herself about it, not to mention the conflict with the feelings she still has for Sasuke (which also have not been adressed/resolved to this point) this would've caused.