In the 45-second video clip, Sunita Arora is purportedly seen raising slogans in the heart of the city amid shut down and police barricading in the area.
Arora, a Kashmiri Pandit, said she wanted to convey a message to the "misguided youth" to return to the mainstream.
She also urged clueless security personnel to raise patriotic slogans.
Arora, after returning here from Srinagar, said she felt proud chanting slogans while being encircled by policemen near the historic clock tower in Lal Chowk and faced 20 security check points to reach the spot with "the national flag hidden in my purse".
"When those who take oath according to the Indian Constitution claim themselves to be Pakistani agents on national television channels then why should I, who is an Indian national, stay away from raising Indian flag in our land," she said.
Arora, however, was prevented from hoisting the tricolor due to the prevalent law and order situation.
The video of Arora's act has garnered huge viewership on social networking sites like Facebook and Twitter with thousands of people 'liking', 'sharing' and 'retweeting' it.
(With PTI inputs)