This Christmas cactus is one tough one (I named her Betty White) 3 years ago she was left in the back of a car in the south that nearly killed her. She recovered, was growing great, even survived getting eaten by cats (twice). 2 weeks ago I left her in a car in -10 degree temperatures for about 6 hours. Her discs are wilted and droopy. I kept her to her normal watering schedule of once a week. Where do I go from here? Do I keep the discs on and just continue as normal? Do I feed her vitamins/miracle grow? My thoughts are to just peel off the discs down the lowest one that looks healthy and continue to water once a week. I have no clue how to proceed here so any feedback would be greatly appreciated.