Not that I can think of off the top of my head. I know that there are the infamous IM references to getting Xanax from her "friend Annie", as well as some miscellaneous references to pot smoking and drinking. However, the question of "what was she doing?" and "where was she going?" has always loomed. Remember, when LE and TES were analyzing her pings, there were those hits out by the airport, and many have theorized that she was riding around, looking for a place to dump Caylee's body, but who knows? She may have been doing a drug deal. If she were involved in that, I would venture to guess it was small time, or we likely would have heard something about it by now. I like your theory because it explains what she could be holding over Cindy's head. I totally agree with you that this family is hiding something.