A 40-year-old Singaporean woman of Indian origin was charged with assault, flouting coronavirus restrictions and public nuisance here on Tuesday.
Paramjeet Kaur was apprehended by the police on Monday evening for roaming with a face mask and assaulting a 47-year-old woman who advised her to put on a mask.
Kaur will be remanded at the Institute of Mental Health (IMH) for psychiatric observation for two weeks.
She will return to court on May 19, reported Channel News Asia.
Her defence lawyer Satwant Singh, who said he was asked by Kaur's mother to take up the matter, told the court he wanted to explain the law to his client face-to-face before she was remanded, as "she has her own rights".
Kaur told the court over a video call, "I am a living woman, and that is my only capacity in this matter. I extend my sovereign immunity to Satwant (the lawyer) and I asked Satwant to represent me.
However, the prosecution asked that Kaur be remanded immediately to facilitate investigations. In response, Kaur said: "No, no."
In another clip, she is heard arguing with others, saying: "I'm a sovereign, I am a sovereign."