don't really have any suggestions other than to find some way to keep your spirits up despite the season...w has to come around in her own time and keeping the focus on her and your energies on her is not helping her and seems to only be bringing you down.
try to keep your chin up spring isn't all that far away..seems like we are all having a bit of cabin fever let's be glad we don't live in one of those places where it's six months night and six months day...(god I'd die there)
get back to you make you happy for you if wife wants to follow that will be up to her...you can't help her she can only help herself!! she knows that you are there if she needs you (or maybe you can simply let her know that you are there if she needs you, her plan, her idea, her goal, you'll do it her way instead of "telling" her what to do) that is really all you can do.