Pragya, who had been undergoing treatment for some aliments at the Pandit Khushilal Ayurveda Hospital, was yesterday rushed to a cancer hospital after her health deteriorated, they said.
Last year, Pragya was diagnosed with cancer.
Doctors at the Jawaharlal Nehru Cancer Hospital where Pragya was taken said some pathological tests had been done on her and the reports were awaited.
She was arrested by the Maharashtra police in connection with the Malegaon blasts of 2008.
Joshi was named as an accused in the Malegaon and Samjhauta Express blasts cases, and was found murdered at Dewas in MP on December 29, 2007.
Meanwhile, Bhagwan Jha, a relative of Pragya, told reporters here yesterday that even after five years of her arrest, not a single case has been filed against her.