You're talking about something different. For the cheat to be effective she would have to see what he was doing, maybe she did anyway? It's also seems certain that he would have kept coaching until she saw unless she was warned for it. But that's not the rule, the rule is clear and to be fair to Osaka it must be implemented when it's caught. The player's box can't coach. Serena wouldn't have received any further penalties if she just shut up and played on. But she was losing, she is a poor sport and she threw a fit. Once again, she isn't the first player to get a warning for coaching, it happens plenty to men and women.