Uta decided to take part in the trial to enhance her physics, but when the trial began, the unexpected happened as her powers began to synchronize with the hypnotic frequencies of the trail, thus greatly amplifying its effect on the singer but also causing her a lot of pain. At first, the changes to Uta's body was minima, but at the six minute mark, something snapped inside Uta as her body transformed in mare seconds. Turned out, this was the moment when Uta's devil fruit power had become fully in toned with the trial’s hypnotic effects. This not only caused Uta to inherit the "will" of the trial, giving her a new lustful personalty, but it also granted her the ability to use her power to copy its effects.
And thus, Uta became a special agent who possessed the ability to infect others. In just a few days, using her new hypnotic powers, Uta managed to track down and corrupt Kalifa's mind and body without her ever stepping foot in a trial.