I was wondering how much the Fluid Nitro Women's Sport Mountain Bike weighs to calculate calories burned when riding
https://www.ozbargain.com.au/node/210733 says 15.3 kilograms but that's for the man's frame. Add 100g for the woman's frame because of the longer top tube.
My google keywords were "Fluid Nitro Sport MTB" without any weight keywords.
http://forums.whirlpool.net.au/archive/2562427 also shows the same weight for the male frame.
I'd suggest you call it a round 16.0 kilos with a full water bottle.