The Tigers were known for their spectacular suicide bomb attacks and controlled a third of Sri Lanka's territory at the height of their power in the early 1990s.
Subramaniam was reunited Wednesday with her family in the northern district of Vavuniya.
Sri Lanka's military conducted a series of vocational training programmes for around 12,000 rebels who surrendered to security forces in the final months of fighting in 2009.
The former militants had a choice of courses including masonry, plumbing, carpentry, psychology and computer programming.
Sri Lanka has denied allegations that up to 40,000 civilians were killed by its troops in the final months of fighting and say that over 12,000 Tigers who surrendered to security forces have been rehabilitated and freed. The guerrilla fighter-turned-politician of the Liberation Tigers of Tamil Eelam (LTTE) underwent a year of "rehabilitation", learning bridal dressing -- how to dress the bride and her entourage for a wedding -- before her release,