I have nothing but respect for Serena in terms of her athleticism, what she's done for her sport, the money she makes, and advancing the causes for both women and african americans.
But she has developed a certain sense of hubris. This is completely understandable. You are young, make millions, have been coddled most of your life and are insulated from the "great unwashed" of the real world. This isn't much different than James or Gronk or A-rod. Eventually, they feel that they can get away with anything. At some point, they are not as good as they once were and struggle with that lack of relevance.
IMHO, this is where Serena is. She has been awesome and is still very, very good. But she is no longer dominant. So, a young Japanese gal is taking her to the woodshed and she lashes out at someone else because a) it can't be her and b) she can't beat her opponent. Who is left? The official. So the official gives her a very minor reprimand and in her hubris, entitlement and anger about being beaten, she can't let it go. So she, and the umpire, escalate until we have that ugly situation. Now, the problem is, all of her handlers will externalize it. No, Serena, its on you. And the sooner you make adjustments to your lifestyle and attitude, the better off you'll be. The good news its not like she was texting her stuff to someone (Favre) or hanging with the hooker class (Woods) or shooting up drugs in her bathroom (name one of 20 entertainment stars dead from OD's in the last 12 months).
Oh her money; God bless her, made as much as you can. On her race and gender; you've done so much, God bless you. But you can go one of two ways now, don't screw up your legacy like Tiger did.