I don't know worried but I would be amazed and would expect Kishi to explain himself ( according to how he decides to go further with the story) in which Sakura doesn't have much of a reaction to what happened to Naruto.
You can see that she worries A LOT about Naruto, while other people just think about being by his side lol.
It began in this chapter :
http://i13.mangaread...uto-4087475.jpg
Than you have that chapter :
http://i3.mangareade...uto-4494049.jpg
Just that. I don't imagine what will happen when she'll know he's about to die.
I see the story ending like this :
Naruto looses Kurama.
His Uzumaki cells keeps him alive after extraction, but won't escape certain death.
The Shinobis close to where he fell will try to help him in vain.
Sakura and Hinata will be there also.
Hinata will stand with the group, while Sakura will be next to Naruto.
Sakura will cry and show her feelings for him (without really confirming her love for him of course, but the reader will find it obvious)
Naruto will make his confession that he promised to do one day, and dies.
Sakura cries like in the OVA and hugs him with all her might
That event will give screentime for Sasuke wich will also be affected, and will defeat Madara (I don't now how), to prove to us readers that Orochimaru was right about the fact he would become stronger than the legendary Uchiha.
Obito knows about Naruto's death, and win his battle against Zetsu. He will find find a way to kill him and bring Naruto back to life at the same time, by using Rinnetensei No Jutsu on Zetsu's spiritual life.
Obito dies after that ultimate action, because of the Rinnetensei he used against Madara (Zetsu kept him alive from that, don't forget).
I don't know if this will happen before or after Madar's defeat, but anyway, that's how I see things going on before the Naruto VS Sasuke battle.
Sakura will cry again and show her happiness for seeing the most important person in her heart back to life.
This event will probably makes her realize her love for Naruto, or at least, it will be the beginning of a change in her heart.
Hinata will realize how much she's in the way after that and will accept fact with a big smile like in chapter 450.
If Naruto is happy, she's happy too, that's how Hinata always felt for him...
Edited by Sojobo, 01 January 2014 - 05:54 PM.