Reposting and translating some of the Chinese spoilers from Baidu.
Sasuke sent a hawk back to Konoha to contact Naruto.
Naruto placed his bunshin in the village and left to meet Sasuke.
Sarada saw the hawk and knew that it was somehow connected to her father. <-- Spoiler provider said he felt touched by this scene.
Sarada decided to follow Naruto. Chouchou was with her.