The Bhoot Returns actress ended her two-year-old marriage with Samrat Dahal this year.
She told the Hindustan Times: "That was a big reason for me to get back into acting. But while I was away, I also realised how much I loved cinema and missed acting in films. It's my passion.
"While I have other commitments to attend to, I also love acting. So I will be doing a limited number of films and take up roles I haven't done before.
"I don't have the energy or the drive to be constantly busy. Offers start pouring in but when they see that I'm not the same Manisha from 15 years ago, they step back.
"But that's good, because I can easily filter the good films from the rubbish then."
The 42-year-old star has admitted that Bollywood cinema is better than when she was first acting.
It has been rumoured that Madhur Bhandarkar's melodrama Heroine is based on Koirala's faded career.
Watch the song 'Saaiyaan' from Heroine below: