Stop spreading nonsense about what happened in this chapter.
She had already stopped healing him because he was stable obviously, not to mention he got kyubi cloak back.
When Tsunade got there he was already confirmed to live, as you see Sakura has stepped aside proof being Tsunade landed and surprised them. That means Sakura's initial efforts until Naruto stepped in was enough. Tsunade is just more experienced and was able to bring in a full recovery(so it seems).
When Katsuya got hurt by the god tree so did Sakura. I'm sure shes on her last set of reserves with her base chakra. So please.
I'm pretty sure current Sakura is doing better than Tsunade did at her age.
^ so basically this. She stepped up when noone else was there so good job to her.