Rather than making any kind of unsubstantiated claim that she is not legit, maybe just post a link to her ad and title the post something like 'a little humor', just so we can all get a laugh at the stupidity, er, I mean lack of forethought of the person who posted the pics.
I just found another ad she posted back in Jan (using tricks you taught me .. you made me a better Brooke .. lol!) w/ pictures of a totally different person.
I'll post her old ad here ... she still has the same number so it wont be that hard to search for her.