 Sini hails from Avoli, a village in Muvattupuzha, Ernakulam district, Kerala.Born to Mundackal Jose Joseph and Rithamma Jose, Sini is an employee of Indian Railways at Ernakulam.Her personal best for 400 m is 53.01 s achieved during the Federation Cup athletics meet in Ranchi on 2 May 2010 where she won a gold medal.