I would have had no problem pointing the wrong thing out if she hadn't 'got it' herself, but I knew she would. The thing to avoid here is being the know-it-all

I would have had no problem pointing the wrong thing out if she hadn't 'got it' herself, but I knew she would. The thing to avoid here is being the know-it-all who tells everyone how things should be done when, given just a second, those people would figure it out anyway. Nobody likes that guy.