I'm so sorry for you loss.
Like others have said, dogs grieve in their own ways ... some for longer periods than others.
If she were my dog I'd pay more attention to her, do special things with her, give her an extra treat now and then, and try to help her work thru this sad stage in both your lives.
Gayle ... Slider, Bruiser & Faith
At the Bridge: Andy, Abbey, Tasha, Tex, Echo, Yukon, JR, Too, Niki, Bo, Ringer, Kelly, Honey & Mac