The woman, a housewife, is said to have been picked up in Sungai Chua, hours after police shot dead the leader of Gang Sasi on Wednesday.
The woman was picked up by plainclothes policemen.
The woman had reportedly tried to resist arrest.
In a press conference, her 26-year-old daughter, who gave her name as Chong, claimed her mother was innocent.
“I do not believe that my mother is involved in a gang. The police threatened to shoot her if she continued resisting arrest,” she told reporters.
Chong alleged that the police had broken into her Kajang Mewah home and seized some family belongings, including two cars.
Chong claimed that her family had not been able to contact her mother since the incident.
Selangor deputy police chief Deputy Comm Datuk Abdul Rahim Jaafar said the woman was picked up to have her statement recorded.
“The mother is helping with investigations,” said DCP Abdul Rahim, who did not elaborate on the connection between the woman and Gang Sasi.