Take extra special care of her. In the two years after my mom died, my Dad had several medical emergencies, which his doctor told us was common when a spouse dies. Often long-term marriages result in the other partner of the pair just kind of seeing no point, and co-deceasing within 2 years or so.
In my dad's case we were able to get him through those crises years with constant attention from his kids and grandkids.
Sorry for your loss.