"Sehgal's condition is very critical. There has been no significant improvement," Sehgal's daughter Subhashini Ali told reporters here today.
She has been placed in ICU and is under observation by a team of doctors, Ali added.
Sehgal (97), who was ill for some time, was admitted to hospital last morning after she suffered a heart attack at her residence in Civil Lines area here.
Meanwhile, CPI(M) general secretary Prakash Karat and CPI(M) Polit Bureau member Brinda Karat have visited the hospital last evening to enquire about her health conditions.
Captain Lakshmi Sehgal was very active in the independence movement of India and commanded the 'Rani of Jhansi Regiment' of INA, formed by Subhash Chandra Bose.
A doctor by profession, she was working as a medical practitioner and a social worker. She was awarded Padma Vibhushan in 1998.