Narges Mohammadi's Health Worsens Amid Arrests
Her daughter confirmed the detention, with no contact from officials.
Sotoudeh criticized the Islamic Republic's policies days before her arrest.
She is a 63-year-old 2012 Sakharov Prize recipient.
Arrest occurs during a government crackdown on political dissent.
Her husband, Reza Khandan, is imprisoned in Tehran's Evin prison.
Sotoudeh said the Intelligence Ministry detained her and seized devices.
No official reason for the arrest was provided.
Narges Mohammadi suffered a heart attack on March 24 while imprisoned.
Chirinne Ardakani reported Mohammadi's health worsening in Zanjan Prison.
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