Even if it was a mutual consent divorce, the courts in USA give reason as no fault divorce or irretrievably broken down, both of them are not recognized as legally valid in India for the marriage that was solemnized in India as per Indian laws.
However the divorce absolute granted by US can be produced as evidence in the proposed divorce case to be filed in India.
She can give power of attorney deed in favor of any close relative in India to conduct divorce case in India on her behalf, but she may have to be physically present before the court concerned at the time of letting in her side evidence.
Her husband cannot file any case to bring her back neither there's any reason to get her passport cancelled.
She can file the case in India as suggested above at her convenience