Quoting BrookeT:" I would probably keep her in if she is not used to the cold. I have a ton of farm cats that live outside ... [snip!] ... that live outside but they are used to the cold and when its really cold they know to go into the barn and keep eachother warm."
Quoting Clarissa Larson:" i'd keep her in. i know someone whhos cat froze to death "
Quoting Rabbit™:" Any ideas on how to keep her happy? She gets really loud if we don't let her out right away. She has ... [snip!] ... lots of string (she loves to curl up with a pile of yarn) and an endless supply of food. I'm not sure what else to do for her."