[1] Kusumasiri was born in Medaketiya (Tangalle) on 26 May 1912, the daughter of Don Davith Amarasinghe and Sophinona.

[2] She was educated at Rahula Maha Vidyalaya, Tangalle, St. Mary's Convent Matara and Musaeus College, Colombo.

[4] In 1948 however he was dismissed from parliament due to his involvement in the General Strike in 1947, losing his civic rights for seven years.

[6] She retained the seat at the 2nd parliamentary elections in 1952, representing the Viplavakari Lanka Sama Samaja Party.

She then unsuccessfully contested the seat of Dehiowita Electoral District in the July 1960 parliamentary elections, polling third behind Soma Wickremanayake and A. F. Wijemanne.