I agree the moment of death is not indicative of what killed her.
I would make sure they have defrosted water at least twice a day (for a day or two) or at least three times a day (if longer than a day or two).
The heat lamp is also a good idea. Many factors affect a duck's ability to withstand cold. This includes shelter (windproof or not, straw to snuggle into vs. sandy floor) and food (ducks can eat twice as much in winter as in summer). Although I have not seen information on this, I would also expect body build to have an effect, with skinny runners possibly losing more heat than fatter ducks.
So sorry that you lost her. It is a hard thing when that happens.
http://wholefedhomestead.com/what-temperature-can-a-duck-survive/
I would make sure they have defrosted water at least twice a day (for a day or two) or at least three times a day (if longer than a day or two).
The heat lamp is also a good idea. Many factors affect a duck's ability to withstand cold. This includes shelter (windproof or not, straw to snuggle into vs. sandy floor) and food (ducks can eat twice as much in winter as in summer). Although I have not seen information on this, I would also expect body build to have an effect, with skinny runners possibly losing more heat than fatter ducks.
So sorry that you lost her. It is a hard thing when that happens.
http://wholefedhomestead.com/what-temperature-can-a-duck-survive/