"The judicial custody of Mukerjea, her former husband Sanjeev Khanna and driver Shyam Rai is extended till November 20," ordered Magistrate RV Adone.
The court also allowed CBI to interrogate Ms Mukerjea and Mr Khanna till November 17.
Earlier, the court had granted permission to quiz all the three accused in jail till November 7 (today).
Public Prosecutor Kavita Patil moved an application and told the court that certain documents need to be "confronted" and (Indrani's) voice samples are yet to be taken.
Ms Mukerjea, on November 3, had given her consent for voice sample test to be conducted on her.
The CBI had earlier moved an application before the magistrate seeking her voice samples saying that it had got hold of some call recordings which purportedly featured her voice, and therefore a verification was needed.
On October 31, the trio was remanded to judicial custody till November 7.
Ms Mukerjea, Mr Khanna and Mr Rai were arrested in August on the charge of murdering 24-year-old Sheena and disposing off her body in a Raigad forest in April 2012, about 84 kms from Mumbai.
Sheena was allegedly strangled in a car, then her body was burnt before being dumped in the forest.
Ms Mukerjea was recently hospitalised after her platelet count dipped drastically. However, doctors at JJ hospital had later made it clear that she had not contracted dengue as suspected.
Earlier, on October 2, Ms Mukerjea was taken to JJ from Byculla womens' prison in an unconscious state, fueling speculation that she had overdosed on anti-depressant drugs.
But the probe by Inspector General (prisons) ruled out the possibility of drug overdose, poisoning or suicide bid.
On October 6, the 43-year-old was discharged and sent back to jail.
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