It takes some people a long time to get over the loss of a loved one. I agree with Yoda - you need to give her some time to really get over her loss. I lost a friend of mine last year, and I think about her often. I couldn't imagine what it'd be like to lose a spouse.

Give her time. I know you're heartbroken and want to move forward, but I bet she's suppressed her grief, and she needs to face it.