According to a senior district police officer, the teen, a resident of Sonarpur's Bayedepara area, streamed the entire incident on Facebook Live with another person on the other side reportedly her boyfriend.
Her behaviour changed drastically after she returned home on Saturday evening after meeting her alleged boyfriend, who had called her over the phone, the officer said.
"The woman's mother claimed that she was silent when she returned home," the officer said.
"On Sunday morning, when she did not wake up till 8 am, her mother became suspicious and on looking inside the house found her daughter's body hanging from the ceiling fan," the officer said.
"Later, it was found that victim had gone live on Facebook while taking the extreme step," he said, adding a probe has been initiated into the matter.