She wasn't really looking out for sasuke, she was Jealous because Naruto is not able to be told off by his parents and she thinks he lives carefree while she is stuck listening to her parent 24/7, and sakura only likes sasuke because he is handsome, strong, and popular, which is the reason she didn't like naruto because he was unpopular and always so cheerful even though people saw him as a demon, curse, and a monster.