On 22 January 2021, Baishali Dalmiya was expelled from All India Trinamool Congress for anti-party activities.
[5] On 30 January 2021, she joined the Bharatiya Janata Party along with Rajib Banerjee, Prabir Ghoshal, Rathin Chakraborty and Rudranil Ghosh in presence of Amit Shah in New Delhi.
[6] She unsuccessfully contested the 2021 West Bengal Assembly Election from the Bally Assembly Constituency as the Bharatiya Janata Party candidate and lost to the All India Trinamool Congress candidate Dr. Rana Chatterjee.
According to General Secretary Imran Ahmed Khan, the Police visited the site to conduct a probe and turned the complaint into an FIR (no.
[7] On 5 March 2021, the then All India Trinamool Congress election agent Rana Chatterjee filed complaint with the Election Commission to take action against Baishali Dalmiya for suppression of material facts and not providing proper information regarding criminal antecedent in her nomination document.