Yes it's normal for them to be molting in winter. The feathers will come back in pretty quickly, but she may cycle out other feathers. It depends on the severity of her molt. After her feathers come back in, then she has to get her body weight back up to a safe level before she can lay again. When her comb turns from pale and shriveled to bright red again, she's close to laying again.
As for helping her through it, supplement her with high protein treats. I raise my birds protein by mixing in game bird starter (30% protein) with flockraiser (20% protein). Mealworms, meat scraps, fish, black oil sunflower seeds are all great treats to help them through their molts. Cut out any "junk" like scratch right now.