"She is conscious but very serious. She is having respiratory trouble and her kidneys are not functioning properly. There is bacterial infection in her blood," the doctor said.
The 90-year-old has been undergoing routine dialysis.
She suffers from various ailments and was put on non-invasive ventilation on Thursday after her condition worsened.
The writer, who was honoured with the Jnanpith Award in 1996, has been undergoing treatment at a hospital here for about two months now.
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