Nalini had said she was not able to complete the marriage arrangements, adding that her daughter living in London is likely to visit India next month.
On July 25, Nalini was released on one-month parole.
The Madras High Court had on July 5 granted a one-month parole to Nalini on her plea for a six-month parole to make arrangements for her daughter's wedding.
Nalini had argued her case in person.
The court had stipulated that Nalini should not meet politicians and media.
In her plea, Nalini said every life convict was entitled to one month of ordinary leave after completing two years in prison and that she had not taken leave even once in the past 27 years she has spent in jail.
Besides Nalini, the six other convicted in the case are her husband V. Sriharan alias Murugan, A.G. Perarivalan, T. Suthendraraja alias Santhan, Jayakumar, Robert Payas and Ravichandran.
All the seven convicts have been in prison since 1991 after a female Tamil Tiger suicide bomber blew herself up while meeting Gandhi at an election rally near Chennai.