I would agree with Nexogen, the plant needs to rest and be kept dry through the Winter. I have seen this happen oft to D. phalaenopsis type hybrids. They are very pumped-up from the greenhouses for flowering and go into swift decline in the home. They can recover, however. At this point I would keep the plant warm (20°C/71°F upwards) and in very good light, without burning sun until you see new growth and roots. I would remove the surface sphagnum moss, as this will only promote rot when wet, at this stage. Do not start watering until the roots, which will be white with green tips, are an inch or so long. They like a bouyant atmosphere with high humidity when growing.
In the end, these orchids are raised en masse for a quick delight. They are heavily coddled with fertilizer and plus-optimum conditions for quick sale. This tends to exhaust the plant making is susceptible to disease and changes in culture. Unless the plant is particularly attractive, I no longer place much effort in recovering it, but, I have learned a great deal about 'rescue' over the years, so all was not lost. Plants ordered from a smaller orchid nursery will tend to be more robust, as they are less pampered, more capable of adapting to new conditions and certainly the better investment. A word of warning; if you cannot maintain warm conditions year round, especially in the Winter, seek another group of orchids for your windowsill. The phalaenopsis lines really require warmth, more than I find comfortable in the home. But I do live in the far North.
Jamie
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