The cross-examination proceedings were conducted in-camera before the Justice G Sivarajan Commission.
She appeared before the commission at 11 am and the proceedings lasted till evening, commission sources said.
Saritha's appearance before the commission came days after the commission ordered issue of non-bailable arrest warrant against her for continuously failing to appear before it.
The panel had on June 23 ordered issue of the NBW while rejecting an application by her seeking exemption from personal appearance on medical grounds and directed the state police chief to ensure her presence today.
The solar panel scam pertains to alleged duping of several persons to the tune of crores of rupees by Saritha and her accomplice Biju Radhakrishnan by offering solar panel solutions.