Koshy made her international debut at the Junior meet in Germany in 2011 in which the Indian team was in sixth place.

Koshy won five gold medals in Thiruvananthapuram at the State championship in the same year.

[3] She won silver in the Asian Shooting Championships and represented India in the 2013 and 2014 World Cups.

Koshy won gold in the 2015 National Games women's 50m Rifle Prone event, the first for Kerala.

From Kochi, she was inspired to take up the sport on seeing a pre-National shooting championship during her childhood; she said that her grandfather was a hunter.