A 53-year-old woman who was spotted without her mask at multiple public venues is being investigated by the police.

She was taken by the police after a video clip of her, insisting on not wearing a mask at The Shoppes at Marina Bay Sands, went viral over the weekend.

Worked in China for over 10 years, came back like a different person

The Chinese paper Shin Min Daily News (Shin Min) managed to speak to the woman's elderly father, surnamed Phoon, who said that the woman used to be a Navy officer.

She later joined a private company and was deployed to China for work.

However, the elder Phoon noticed a drastic change in Phoon's temperament after she returned to Singapore more than 10 years ago.

He told Shin Min that he thinks Phoon could have suffered some emotional trauma and was cheated by someone in China.

She was like a different person after she came back, the elder Phoon said.

She used to be kind and charitable. Besides sending money to him while she was in China, she also sponsored some orphans in the past, he told Shin Min.

Not picking up his calls

In response to the recent news, the elder Phoon admitted that he is worried about his daughter.

"But after all she is in her fifties, she should know what to do," he added.

He had tried calling Phoon but she did not pick up his calls.

The father and daughter do not meet often. When they do, Phoon usually visits her father at his house.

They last met on Chinese New Year, he told Shin Min.

Top photo via Facebook video