Day length has a much bigger effect than temperature.
It's common for people to provide supplemental light and get eggs all winter long, even in very cold climates.
On the other hand, you could keep chickens inside a climate-controlled building at the perfect temperature, and short days would still make them stop laying in the winter if there were no lights other than the natural sunlight.
There is a good chance that she will start laying sometime in the next few months, as the days keep getting longer.
But with that track record, she will probably never be a very GOOD layer. (Unless she has been laying all along and something has been happening to the eggs. Hidden nests, or eggs getting eaten by the hens or by other animals, are other reasons that you might find no eggs, but I'm guessing you have already checked for anything like that.