Heckling has been around since the inception of competitive sports and it'll be here long after everyone in this thread has been turned into dust. Seeing the subtle push by some to completely eliminate visceral human responses in sporting events that isn't applause or outright silence is bizarre and a fools errand.
Sports by its' very nature invokes emotional resistance and/or acceptance. Us vs Them. My guy/girl vs your guy/girl. High school sports have heckling. I heard much worse inbounding the basketball in 10th grade than, "You suck." I can only imagine how the scrutiny is amplified the higher up you go and the more success you attain, but it's part of it. Nobody said it'd be easy, but neither is being a world class athlete. Just as in real life, some will love you while others will detest you solely because you're breathing the same air they are.
As an elite athlete, you have to be able to compartmentalize and perform, often amongst the backdrop of disparaging comments about your ability. It's what makes the truly great athletes great. The Williams sisters. Lebron James. Floyd Mayweather. Kobe Bryant. Muhammad Ali. It's not just their ability, but their mental toughness to battle through the adversity, both on the field and in the stands. If you can't handle it, you're in the wrong business. You can't take the fame & fortune & leave the criticism and negativity.
Whether she has lingering mental health issues or she simply can't handle the thought of someone disliking her, she's doing herself a disservice currently by continuing to subject herself to a profession that she currently lacks the mental fortitude to withstand. For her sake, I hope she figures it out because unless the world ends before her next match, hecklers aren't going anywhere.