In the Anime, when Sakura, Naruto and Jiraira went looking for Orochimaru's hideout. I think you can see a jealous reaction when Naruto says that he's relieved to see Sasame-chan safe.
If Naruto ever dates a girl, Sakura will probably follow him to see where he goes and what he does. This could be a fun chapter, since they haven't had a real date yet.
Sakura was jealous for real! I didn't catch that I may have re-watch that arc.