The holidays bring out a lot of good memories for them and they want that "pull" for just a while. Once the holidays are over, it's back to their normal MLC behavior. Also, I don't know about your state, but if you are sleeping w/your wife, the clock stops on the time of separation and it will have to be reactivated if she leaves again. I found that out when my I was going through my separation/divorce because I asked that question just to be on the safe side.
Listen to the advice of others. Irish has given you some good advice about the fact of a relationship dying. If it is dying or has died, she will need time alone to process it and you don't want to be the rebound for just a little while. She needs to face all of this on her own and, if and when she's ready to do the hard work to earn your trust and be a wife, companion and mother again. Don't be too quick to welcome her back into your bed...leave her to finish baking. She's half way there.
Sit quietly, the answers will reveal themselves when you least expect them to. The past is gone, the present is a gift and you need to focus on today, allow the future to reveal itself when it is ready.
