I was just in the same boat as you. My baby blood (maybe 1 ft. long) arrived 11/22. I tried feeding her last Sunday without success, but she had just eaten a week before at the breeders and was on a bi-weekly feed schedule. I tried a live mouse that night in a size that seemed right for her size (A little thinner than her girth). She had absolutely no interest in it and actually crawled away from it. Zippo luck.
Well, last night she took a pinkie rat. She had several food options in her enclosure (almost a fuzzy rat, a really small mouse and this pinkie).
I know it was too small of a meal, but at least she ate something. I did the same as you: fed her at night, shut off the tank light and other lights in the room and actually placed her in an ice cream pail with the food. I gave her an hour, watching periodically to make sure nothing in there would bother her. She took the smallest thing there was.
I was starting to get pretty concerned, because EVERYTHING seems like a variable that could be screwing things up when you have a new snake in a new enclosure. Do I handle or not? Is the temp and humidity right? Is the food too big or does it smell wrong? Is my snake sick? All those questions to consider and stress about.
Hang in there with the feeding issues--that's the way I'm looking at it. Sooner or later your snake has to eat if it's otherwise healthy. Plus, they don't want to die. Sounds stupid, I know, but it's gotta be true.
Keep posting as time goes on here, and I'll do the same. Maybe we can learn something about these little guys together and from our experiences.
I'll be happy to hear how your snake is doing. Good luck!