I am currently at 46 nights with 3 more stays to occur- 1 short of the magical 50 for Gold. I have the Marriott credit card and know I have purchases that will give me an additional night but will not get that credited until mid January. Will I reach Gold with this credit or will I stay Silver and be at 40 nights(50-10 for sliver status)?
I'd call the silver line and simply ask them. They can & almost are very helpful.
If not, and it sounds silly, find a very inexpensive property over the hoidays and take your wife there for a quick getaway. The point bonuses are worth it if you will be traveling next year and they would most likely extend your gold through 2014 if you get close in 2013.