The co-leader of the political party, which campaigns for environmentally friendly policies, spoke out in favour of the so-called "London Declaration" for a "Referendum 2020 campaign seeking a "sovereign state of Khalistan", being organised by US-based group Sikhs for Justice.
"I stand in solidarity with all those joining the London Declaration, and those fighting discrimination and campaigning for a referendum around the world," she said.
India has registered its formal opposition to the event through a demarche when news of the rally emerged in July, with the Ministry of External Affairs (MEA) saying it expected the UK government would not allow any such group whose intention was to spread hatred and impact our bilateral relations to use UK soil for such a rally.
"It is the success of the British Sikh community, which sent more than 47,000 emails to their MPs urging them to support London Declaration and oppose India's interference, said Paramjeet Singh Pamma, one of the organisers and UK-based Khalistani activist wanted in India over his alleged involvement in bombings in Punjab in 2010 charges he denies.
Scotland Yard said it had not received any complaints regarding the event on Sunday, which will be allowed to go ahead without any restrictions.
Opposition Labour party MP Preet Kaur Gill, who chairs the All Party Parliamentary Group (APPG) for British Sikhs as the first female Sikh MP in the House of Commons, said she supported the group's right to protest safely and in peace with all relevant permissions.
She struck a note of caution that non-binding referendum have very little impact on governments and called on the organisers to give due regard to the possible implications of those taking part in any such potential referendum, as the issue has seen some young people imprisoned in India for promoting the idea.
(This story has not been edited by Business Standard staff and is auto-generated from a syndicated feed.)