Manisha might float a new political party to join politics, her family sources said.
However, it is unlikely that the Nepali Congress party, which had expelled her father Prakash Koirala for favouring King Gyanendra's autocratic regime, would grant her membership, according to Nepali Congress sources.
Prakash Koirala became Education Minister during the King's 14-month-long direct rule.
Nepalese student bodies asked people to boycott Manisha's films after she openly canvassed for a Mayoral candidate two years ago during municipal polls, which was boycotted by pro-democracy alliance.
Manisha's grandfather B P Koirala was the first elected PM of Nepal 45 years ago when NC got two third majority.
Now his younger brother G P Koirala is the Prime Minister of the Seven Party Alliance government that has forced the King to quit power in April after a 19-day uprising.
Manisha, who is involved in different social activities, frequently visits her hometown Biratnagar in eastern Nepal.
Manisha's foray into politics will possibly not go well with the Prime Minister's daughter Sujata, who considers her a rival, party insiders say. Manisha's younger brother Shashank, a doctor by profession, is a central member of the Nepali Congress.
Family sources refused to give the media a date for her entry into Nepalese politics. "It is upto Manisha to decide when to join politics", Prakash Koirala said.