Why suddenly curly leaves ?

curled up edges look like heat stress to me and the light browny spots would be a cal mag definceny In my opinion cause thats what it looks like give her a mist down with spray bottle or a revive foliar feed and you will be golden my friend :) the cold wont do alot to her it jsut stops her growing as fast as she would do if temps were correct I would put it down to either abit too much water or lack of nutrients. when plants are hungry they often fade yellow eating the fans in search for nutrition.