She was performing at Welcome to Rockville with her band and when she felt the urge to pee, knowing she couldn't just stop the show because of it, she decided not to hide behind anything that might hide her private parts and instead called a fan. stage and pissed on his face for all to see
Her fans and bandmates did not expect this and her band even released an apology on her behalf, though she has not addressed this at all.
She could have done what Fergie did a few years ago, when she felt the need to pee, she had the courage to continue acting after peeing her pants and she earned a lot of respect from her peers. I wonder if Sophia's peers respect her for how she dealt with her full bladder.