If you have to do it in the winter, if that is safer, (in terms of being able to feed and maintain heat for digestion- if you can't do that, it's safer to brumate her than to starve her or to have her digest in too cold temps) then it would be okay. You don't just put her away for a few months, though. She gets a last meal, digests it, you wait two weeks, then turn off her heat (or stop supplying it). You put her in a smaller container, with a water bowl, and put her in the cool dark place. You have to check her weekly, though, to make sure she is all right, and hasn't spilled her water. Snakes, while brumating in captivity, aren't out cold- they are still a little active. When you bring her out of brumation, you remove her from her small bin and put her back in her viv, and let her gradually warm up, turn on/provide heat, and then feed her in a couple weeks after she is warm and back to normal.