Wow! it seems you are all kinda clueless about girls/women.
Lemme say, that what YOU think is the best thing to do, is not necessarily the best way to go about handling the situation.
You all said, "wait" then call, etc, but let me give you a little hint: honestly, that makes it worse, most of the time.
Personally, if i got into a fight with s/o, even if he thought the whole thing was stupid, its better for the guy to approach the girl with even just a call, kiss, hug... Not even to say "i am sorry for _____" but just let her know that you are aware that something made her upset.
That really does make all the difference. Especially if you dont think the whole thing is a big issue, you will really make her feel good by not waiting to call her or let her know that her feeling mean something to you! 🙂