Sithamparanathan contested the 2010 parliamentary election as one of the TNPF's candidates in Jaffna District but the TNPF failed to win any seats in Parliament.[6][7] In February 2011 Sithamparanathan became one of the vice-presidents of the TNPF.[8] She contested the 2015 parliamentary election as one of the TNPF's candidates in Jaffna District but again the TNPF failed to win any seats in Parliament.[9][10]
