The agency arrested Manoranjana for allegedly taking money from Saradha group chairman Sudipto Sen by threatening him.
CBI sources said she has been accused of misappropriation of funds, cheating and criminal conspiracy.
Matang is already under judicial custody in connection with the scam.
The agency has also arrested Kolkata-based entrepreneur Ghosh, co-founder of the now-defunct Xenitis Group, in connection with the scam.
Last year, the Enforcement Directorate had arrested Ghosh who faced money laundering allegations related to the scam. He has been on bail since August 26 last year.
CBI spokesperson Devpreet Singh said both the arrested accused will be produced in Alipore court here tomorrow.
