Indrani's application, filed on February 5, says her health was deteriorating.
CBI said in the reply that she was being provided with medical treatment at Byculla women's prison here where she is lodged.
She was being given nutritious food from the jail canteen and as per the medical reports, her condition was good, it said.
Indrani's application claimed she was suffering from frequent black-outs. She had developed 'chronic small vessels ischemic changes' and as a result supply of oxygen to the brain may get interrupted, leading to brain stroke which could be life-threatening, it said.
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Sheena (24), Indrani's daughter from an earlier relationship, was murdered on April 24, 2012. The murder came to light only last year.
The hearing on the bail application may take place next week.