Shushmita had announced her resignation in a short letter to Congress interim president Sonia Gandhi. "Please treat this as my resignation from the primary membership of the Indian National Congress. I cherish my three-decades long association with the Indian National Congress. May I take this opportunity to thank the Party, all its leaders, members and workers who have been part of my memorable journey," she wrote in her letter.
"Madam, I thank you personally for your guidance and the opportunities you gave me," she further added. Dev's exit has surprised many in the Congress as she was known to be a staunch Rahul Gandhi loyalist. She was extremely proactive as the head of the Mahila Congress and led a number of protests on women's issues.
Soon after her resignation, Sushmita met Mamata Banerjee's nephew Abhishek which raised speculations of her joining the West Bengal's ruling party.