She must've coughed pretty loudly if you hear her despite wearing earplugs. I agree with rashminet84, you should have approached a test proctor. She coughed ONLY during your verbal, or throughout the test? If she did so throughout the test, I would have at least made a complaint during a break session.
She started couging during my Verbal. I assume we started the test at the same time because she had come out after me and was talking on her cell phone (and that is not allowed while you're still taking the test) when I was leaving the center.
If she had started coughing during Quant I would have brought it up.
Lol... I just noticed your score, if I got a 750, I've taken the coughing as my lucky charm! Forget about it & enjoy your awesome score! Which schools are you applying to btw?