Sim Freezing to Death while wearing Warm clothes

When my ranchhand froze to death, I didn't think anything of it, I just figured she wasn't wearing warm clothes. BUT then my sim started freezing to death even tho she was also wearing her warm clothing. I even tried changing her outfits and bringing her inside and she still had the moodlet. What is happening here? 

side note/question: my ranchhand did die and it won't let me dismiss her or hire a new one. help?