saecho, I think your plant is going to make it..it is already making a new leaf, so that is good! Just be careful in watering for now.
Sans are quite cold temp sensitive..that I learned very well now. I got blindsided knowing it was the only plant that survived inundation during flooding at my in-laws in Manila which lasted for a month. I realized afterwards, after I almost killed my Sans, it survived those flooded conditions, since temps there are always warm to hot. Unlike here, we got such varying temps especially when cold temps sets in. Colder temps and less light in winter, so it just slows down growing..so got to lessen or no watering at all to keep it alive indoors, but still giving it bright light and keep it as warm as you can.
Orchids are of varying kinds. I do grow some, but I choose which ones will thrive here. It took me awhile to understand the cultural differences of growing them. Slowly getting the hang of it. Still hit and miss at times, still learning a lot along the way. But it does take a certain amount of discipline in watering them, got to be attentive to the media if it is still wet and learning to observe when it is resting before it resumes active growing again after it blooms. But I do love them..so addicting to collect, especially when you get the hang of making them rebloom. They give me cheer in winter, when I get some to rebloom when all other plants are just resting.