I think it was entirely possible that they did coach Lisa on how to play Venus, but tell someone what to do and that person actually executing what was told are two different things.
I didn't see the entire match, but from the little that I saw, Lisa played an excellent match. Venus' performance was really poor, she got tight in the tiebreak. She makes no excuses because there are none other than she didn't have a strategy and she lost her confidence during that match. In essence, conspiracy or not, Venus lost a match she should've won.
To hell with Mary-Joe, Pam, Martina N. and whoever else. They'll never like Venus because doesn't act fake with them. She knows that they're bias against her that's why she wouldn't give them the time of the day.