The woman, identified as Bhavna Arora, who claimed to be in-charge of Punjab unit of Aam Aadmi Sena, was whisked away from the venue by police immediately after the incident, a senior police official said.
The official said she has been detained and is being questioned at Model Town Police Station in North-West Delhi.
The police has also initiated the process of registering a case under IPC sections 186 (obstructing public servant in discharge of his public functions) and 353 (assault or use of criminal force to deter a public servant from discharge of his duty) in connection with the incident, the official said.
The police said Arora is not married and lives with her family at Rama Vihar in outer Delhi's Rohini sub-city.
The incident happened around 4.50 PM today when Kejriwal was five minutes into his address at the rally organised by the city government to thank people of Delhi for making the pilot road-rationing scheme a "grand success".
