She faced a crisis during the day after which doctors took an emergency decision and used endotracheal intubation to remove the fluid accumulation from her lungs and ease her breathing, doctors said.
Sen's blood sugar level is under control, but oxygen saturation is fluctuating making it a cause for concern, they said, adding that her low food intake has made her weak.
Sen was also administered nebuliser, they said.
Her vital organs like kidney are, however, working properly, critical care specialist Dr Subrata Maitra said.
Sen has been put on oral prescribed diet supplemented with peripheral parenieral nutrition and seen by Pawan Agarwal and Dhiman Ganguli.
A medical-team led by Maitra is monitoring her condition 24x7.
The 82-year-old actress was admitted to Belle Vue clinic on December 23 following a respiratory tract infection.
As her health turned critical, West Bengal Chief Minister Mamata Banerjee, CPI(M) leader Robin Deb and monks from the Ramakrishna Mission in Belurmath and Narendrapur visited the super-speciality hospital.
Banerjee said, "This is a very sensitive period ... We wish that she returns home fast."
Sen had starred in memorable Hindi films like 'Devdas', 'Aandhi' and 'Saat Paake Bandha', 'Agnipariksha', 'Saptopadi' and 'Deep Jele Jai' in Bengali.
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