Can't blame the spectators. Her back didn't look like hurting during the match. She was totally dominated by LXR, and looked like she could not get more than 5 points in the 2nd game. She called for medical, and just after the guy sprayed on her back for a few seconds, she quit. It didn't sound like she wanted to continue at all. I guess most people watching will have a first impression that she just wanted to save face.