I wish you well but I worry that your temperature is too high. Many turtles will stop eating at temperatures in the mid-50’s but their metabolism is still somewhat active until it gets colder than that. I always hibernated my Eastern Box female in very damp sphagnum moss in a slightly ventilated plastic box in the back bottom of my refrigerator. She stayed there from October until April of every year. The temperature there was always between 40 and 45 degrees F. and she did well for years. A good source of info on this is http://boxturtlesite.info/dvmhib.html