All-Women Police in Pudukottai in Tuticorin District registered the case against the MP, her husband Lingeswara Thilagan and their son L Pradeep Raja based on a complaint by the woman who had worked along with her sister as domestic help in the house of Sasikala, when she was the Tuticorin Mayor from 2011 to 2014, they said.
The case was registered after the Tuticorin Superintendent of Police to whom the complaint was given forwarded it to the Pudukottai All-Women Police station.
Pushpa, who reportedly slapped DMK MP Trichy Siva at Delhi airport recently, was expelled from AIADMK on August 1 by its supremo Jayalalithaa on grounds of violating party principles and ethics and bringing disrepute to the party.
On the same day, the MP alleged in the Rajya Sabha she was slapped by a "leader" and faced threat to her life in Tamil Nadu.
Last week, Pushpa's husband and her son had moved the Madras High Court claiming that a case had been registered against them by Anna Nagar Police in Chennai and sought anticipatory bail.