The woman had filed a complaint in west Delhi's Tilak Nagar police station last month and after seeking legal opinion, a case was registered, the police said.
On April 2, the woman allegedly slapped Mr Singh during a rally near Chaukhandi Chowk in west Delhi's Tilak Nagar. However, when police reached the spot, nobody was found there. AAP leader Jarnail Singh, who had made the call to the police control room was contacted, and he told them that they would lodge a police complaint in the matter.
However, the woman party worker, who claimed she was not allowed to raise the issue of alleged corruption in MCD poll ticket distribution in the party, filed a police complaint against Mr Singh's staffer.
She visited the Tilak Nagar Police Station on the same day along with her husband and gave a written complaint alleging that she was molested by Mr Singh's PA and an AAP supporter, the police said.
She even submitted an audio and video recording of the alleged incident, they added.
Following her complaint, the police sought legal opinion from an additional solicitor general in the high court. He said that a case of molestation is made out.
A compliant was lodged on May 17 against Mr Singh's PA Ajeet Tyagi and AAP supporter Inayatullah Khan.
In the incident where Mr Singh was slapped, his PA gave a complaint against the woman on the night of April 2. However, police was informed that the AAP leader doesn't wish to get a medical exam done following which the complaint was closed, the police said.