In my opinion the only thing Hogstedt can do is employ a male player who can play like Serena (obviously you can't find a female) and well, LOOK like Serena. Then have Maria play him over and over, hundreds of times if necessary, until she can play fearlessly.
But Serena is one of the best players in the history of tennis. Losing to her when she plays like does is certainly no shame. Maria is still a great tennis player.