I don't (or am hoping) see her dying but that is true about Obito and needing the eye to get to the other dimension :/ but if she destroys the eye, how is she getting back over regardless? Madara just took Kakashi's eye so either Obito takes the hit for Sakura and Obito vs Madara til he gets taken over or Sasuke foreshadowed going over into the other dimension and saving her. Naruto might have placed a ftg thingie on her or might use the one that i think is on Obito, but thats a long shot. I really like Sakura but her against Madara is a joke.....