http://en.wikipedia.org/wiki/Irom_Sharmila
The reason she is protesting is a law called Army Special Powers Act: http://en.wikipedia.org/wiki/Armed_Forces_%28Special_Powers%...
Why the law was enforced in her region etc is a huge history and is well beyond the scope of a HN comment.
http://en.wikipedia.org/wiki/Irom_Sharmila