Manjhi joined the JMM in the presence of party supremo Shibu Soren along with her supporters, party General Secretary Suprio Bhattacharya told reporters here.
Manjhi, who was one of the ministers that crossed the floor in the Assembly to pull down the erstwhile Babulal Marandi-led government in 2003, had joined Marandi-led Jharkhand Vikas Morcha (Prajatantric) some time ago and was appointed as its vice president.
She was also one of the ministers in the erstwhile Arjun Munda government that succeeded Marandi's regime.