Sakura knowing she's already in love with Naruto? Eh ... can't really buy that. Not at all, it just doesn't seem right to me. I
want to believe it, god knows I absolutely hate her thinking she still loves Sasuke. I hate SasuSaku more than anyone probably knows so I'm not happy with this, but my realistic side prevents me from believing in it.
If that was the case then, well, wouldn't have some sort of big moment when Sakura looks like she realized something? There doesn't have to be dialogue, but if Sakura knows she loves him, I'd expect a big tease like a absolutely shocked "it all makes sense" expression then a fond smile at Naruto or two. The unfinished sentence? She didn't look like she realized something, she looked confused and heavily interested in what Yamato was about to say until it got interrupted. Knowing Sakura the way I do, I believe she asked herself "
What was he trying to say ... ?" but then pushed it away, leaving it unanswered because she doesn't like the confusion and uncertainity Naruto brings her. At least in that subject.
As
NaruSaku4Life said, it was too soon for that to be realized. Early Part 2, after all. And though Naruto was making a dramatic increase in her heart already, it seemed to Sakura it was still "all about Sasuke". (3rd Databook Character Chart, I believe. Sakura -> in love with to Sasuke and -> worries over to Naruto). At least consciously to her. Let's not ignore the fact that this was confirmed in the 3rd Databook as well:
"What are her feelings for Naruto? Sakura still doesn't have an answer." This was by the time of the "Search for Itachi" Arc and "Sasuke vs. Itachi/Jiraiya vs. Pain".
Now could Sakura realize she loves Naruto sometime between this and the Kage Summit? Well, that's only a few months distance, right? It's not impossible she may figure out her true feelings but
something would have to trigger it. Something big and impacting. Sakura did not have this during that time, not even when Sai told her Naruto loved her. For example, look at the NS OVA and the massive moment between them. It was brought on by nearly losing Naruto, and to Sasuke no less (it seemed that way). If this
really happened in the manga, a live-or-death situation like that, especially thinking Naruto was dead, it would trigger her to realize she fell in love with him. Naruto turning out alive reinforced it. As the saying goes, "You never realize what you have until you lose it."
Sakura's confession ... it was badly-timed with good intentions. She didn't really know if she romantically loved Naruto or not, but forced herself into it because of cirumstance. She wasn't ready and neither was Naruto. When her love for him is shown, it's always subconscious. She just reacts without thinking to things relating to Naruto, it's instinctual. Usually, this is how her true feelings for Naruto show through. Ironically, regarding Naruto, her mind can't catch up with her heart and with Sasuke, it's the opposite. Her heart can't catch up to her mind. At least ... in both cases, not yet.
However, I noticed something about the confession. For someone who was a so-called "liar", she got righteously pissed off when Naruto said she was lying to herself. Honestly, I can't see an anti-NS point here, I see a pro. If she truly knew she was saying she loved him and lying, I'd expect an expression of guilt, not anger. You know Sakura, she cares a lot. Remember when I said Sakura shows she loves Naruto subconsciously? I firmly believe this was a perfect example. It really does not add up with "Sakura doesn't love Naruto" theory, not counting her terribly sincere expressions when she hugged him (which, hilariously, Naruto missed). She wasn't thinking "
I'm doing this for you! Don't get mad at me!", rather it seems to be "
What right does he have to tell me how I feel?! How dare he act so superior and call me a liar when I'm the one in charge of my own feelings? He has no idea how I've been feeling lately, he shouldn't act like he does." That's the feel I get out of that scene and her anger. She doesn't understand her own feelings for him so she took that as an insult and a show of superiority, Sakura is not the type of person to like people trying to say how she feels. She wants to figure it out on her own. "How do you know if I don't like you?!" was basically what she was expressing during 470.
As a footnote, I'd also like to mention the other reason why I can't believe she knows she loves Naruto: 540. If she knew she loved Naruto, she would not of thought of Sasuke first. That was very vital in reinforcing the possibility she's still confused over what she feels for him.
I believe, at most, Sakura probably knows she finds Naruto physically attractive now (
She had better at least know this. I swear, if she doesn't, she's in bigger denial than Naruto. 
) and is aware they are not "just friends" anymore. Since Early Part 2, she has recognized that their dynamic is changing and is a lot more complicated. Probably more self-aware of this than Naruto tbh (Who still sees Part 1 Sakura in all her Sasuke-obsessing glory, thanks to the PoaL's protective mind wall). However, she's confused on how far that line crosses. Is it extremely strong friendship that makes her feel the way she does or is it more than that?
Is she actually falling in love with Naruto?Sakura doesn't know yet. Just like the entire Naruto fandom, without biasness, are also desperately wanting an answer. We're simply waiting with her.