Addressing party workers at the party's Model Town office, Maryam congratulated PML-N workers and supporters.
Khan turned the by-election into a plebiscite about corruption and has accused the provincial Punjab government, which is run by Nawaz's brother Shahbaz, of abusing state resources to help the PML-N campaign.
Kulsoom Nawaz is now in London undergoing cancer treatment, with her husband at her side.
Arrest warrants can be issued for former prime minister Nawaz Sharif and Finance Minister Ishaq Dar if the suspects continue to remain absent from NAB proceedings.
Donald Trump shares video of himself hitting Hillary Clinton with golf ball
Representative Adam Schiff, said the retweet did not make him question Trump's recent outreach to Democrats but was disturbing. In July, Trump retweeted a video of himself pummeling a wrestler with a CNN logo for a head.
Also read: Who will win the NA-120 by-election? Sharif's daughter, Maryam, led the campaign for the seat in Lahore.
File image of Maryam Nawaz. In an interview with Reuters before the vote, she hinted at military involvement in her father's ouster.
Rohingya refugees are a threat to national security, Centre tells Supreme Court
According to home ministry officials there were almost 40,000 Rohingya Muslims staying illegally in the country. Desperate Rohingya grab for aid handouts of clothing and food in Tankhali, Bangladesh.
According to the unofficial results, Kulsoom Nawaz secured 61,745 votes while her rival, Yasmeen Rashid of the opposition Pakistan Tehrik-e-Insaf (PTI) or Justice Movement bagged 47099 votes, an election official said at a news conference Monday morning.
Advocate Ishtiaq Ahmad Chaudhry of the Pakistan Awami Tehreek (PAT), PPP's Faisal Mir and Nabeel Shahzad of the Milli Muslim League (MML) had filed the petitions in the High Court.
Election banners for MML's candidate, Muhammad Yaqoob Sheikh, prominently featured images of Hafiz Muhammad Saeed, the JuD chief and founder of LeT. Saeed remains under house arrest, although under no formal charges, by Pakistani authorities under an anti-terrorism law.
The election was also significant because of Muhammad Yaqub Sheikh, a United States designated terrorist.
NIA conducts raids at residences of Hurriyat-G leaders
The NIA on Wednesday conducted raids at 11 locations in Srinagar and 5 in Delhi in connection with the Funding case. President of Kashmir Bar Association Mian Qayoom was questioned by the NIA for almost seven hours on Wednesday.
Nisar recently said Maryum could not be accepted as party leader.