She contested for the NA-120 seat despite her failing health and secured 59,413 votes and defeated Yasmin Rashid of Pakistan Tehrik-e-Insaf (PTI).
Kulsoom, the wife of Sharif, died Tuesday in London after a long battle with cancer. She further underwent multiple surgeries and around five chemotherapy sessions.
She would not take to politics again until a year ago, after her husband - now prime minister again - was disqualified by the Supreme Court from holding a public office.
Meanwhile, Shehbaz Sharif will leave for the United Kingdom on the next available flight to bring back the body of his sister-in-law.
Leaders from across the political spectrum in Pakistan sent in their best wishes for Kulsoom during the length of her illness.
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Sharif, three-time prime minister, is now serving a 10-year jail term in Pakistan following his conviction by a court on corruption charges.
Mr Butt's family has Kashmiri origins and has deep roots in Lahore city, while Razia Begum hailed from a well-known family of wrestlers from Amritsar, India, who migrated to Lahore in 1947.
He has directed the Pakistani High Commission in London to assist in provision of all necessary facilities to the heirs of the deceased. "My condolences and prayers go to the Sharif family", the premier wrote in a tweet. "The government is ready to extend all our support within the legal boundaries", he said.
According to sources, the Sharif family has made a decision to bring back Kulsoom's body to Pakistan, it said.
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Shortly after the news broke on media, condolence messages began pouring in. "May God bless her soul".
Begum Kulsoom served as first lady of Pakistan for three non-consecutive terms from 1990-1993, 1997-1999 and 2013-2017.
Chief Justice of Pakistan Justice Saqib Nisar Tuesday expressed grief on the death of Begum Kulsoom Nawaz and condoled with the Sharif family. She was running for a by-election in her PML-N's stronghold of Lahore at the time.
"She was a courageous lady, and will be remembered for her struggle for democracy and for her love for the people of Pakistan", Mushahidullah Khan told Arab News.
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