If I am reading your posts right, She wrote that on her wall??? and a bunch of guys liked and complimented the comment.
If that is the case, nothing witty or cool you write will be any better. She is getting what she wanted out of the post, compliments and "likes". It's for attention. Don't succumb to it. Wait it out a few days and a few more posts then write something on her wall that says something of how you are cool and cocky. I am not really sure what your relationship with her is like, if you two hang out, go out, etc. So I can't really help with a solid comment since there is limited details.
But, you have to remember, girls write sh!t on their walls for the likes and comments. So, if you comment on that post, you are just as good as any of those other guys. You have to stand out from the rest. Be something different. But if you are in dire need to respond to that wall post, I'd maybe say something like... "Thanks for posting that about me. You didn't have to."... again, I wouldn't recommend it though