I would have to say that she would be initially surprised, then reflective, and finally she wouldn't change much towards Naruto. I still think that she would beat the crap out of him if she felt like it because that is her way of showing affection, I think. (ouch... tough love)
No, she's not sadistic. It's when he does something perverted, acts really disrespectful to someone, or (to a lesser degree in part 2 of the manga than in part 1) says something stupid. Stupidity is more likely to cause her to either- tease him, sigh in exasperation, roll her eyes, or at most yell at him. She tolerates Naruto's ignorance as something not completely in his control, although she has tried to get him to see that he does need to read to learn some things. Maybe now that he's had a pleasant reading experience- reading Jiraiya's Legend of the Gutsy Ninja, maybe he'll stop resisting reading for knowledge as much.
I'd love to see a scene where Naruto gives Sakura a copy of Legend of the Gutsy Ninja. He'd have to explain to her this book wasn't like Jiraiya's others, that he didn't like those type novels, but this novel was good. Sakura would look doubtful. It would be cool if Tsunade happened to be in the room and said that Naruto was correct, and add that it was the only book that Jiraiya wrote that she liked. Sakura would definitely love the novel too. It would be great if Tsunade said that Naruto's parents loved the novel so much that they decided to give Naruto his name in honor of that character.
Dream you dream alone is only a dream, but dream we dream together is reality- Yoko Ono 1971
When you go to war, both sides lose totally- Yoko Ono
Remember, our hearts are one. Even when we are at war with each other, our hearts are always beating in unison- Yoko Ono 2009