It's going to be when Sasuke flares up against naruto, basically what would Sakura's limit be before something bad happens to naruto. The aspect of either dying is what she fears, but we mainly need to see where her distrust of Sasuke leads too. But I'll say this, things look negative from her to Sasuke yet she always views naruto greatly. If anything sakura is maturing but at this point it could possibly be that she subconsciously loves naruto, not realizing it yet. It's not going to happen all at once but there will be a trigger to make her realize what it is she truely feels for naruto. Even then many events for ns remain in play we can say, naruto confessing to her, the forehead ordeal, sakura revealing she knows how naruto feels, revisiting the land of iron actions (if that's needed, I mean it's also likely naruto forgave sakura or understood why she did what she did after sai told him). Ever since 631, many new things opened up for ns, don't be suprised if the whole forehead event comes up.
I like your theory . I hope this will be how it pans out .
