Part 1 Sakura did not have the ablities or strength she got in part 2. What made the difference is that training with Tsunade. That made her more useful in most situations.
As far as being emotionally stronger part goes. I feel you could thank Naruto for that. Since he took her burden to bring Sasuke back upon himself. At one point she thought killing Sasuke was the only way to free him. That to me is not a sign of emotional strength. It is a sign of weakness. She had completly lost faithe in herself and made a mess of it when she could never do it herself. It was Naruto who came in during that time to restore her faith. My point is she was still heavily reliant on others through out the series. She was never emotionally stronger herself.
False, in fact Naruto trying to do everything on his own can be taken as an emotional weakness. Furthermore, doing things yourself is not a sign of emotional weakness. Unless Itachi Uchiha was an emotionally weak guy since he was crying when he killed his parents... no.
Hasn't Naruto uzumaki been reliant on people throughout the whole series? The aim of the series is co-operation between people. Sakura has been there for Naruto also.. It was Naruto who never shared his feelings.. wanting to do things on his own. She never lost faith in herself, she lost faith in Sasuke Uchiha.
Understand her being all emotional infront of sasuke =/= emotionally weaker. Because with this logic, Sasuke and Naruto are wimps..