Firstly, may I say that there is no time limit to grieving and we all deal with our losses in different ways.
One of my best friends in Australia died the Christmas Day before last, and even though I had not seen her since I returned to England, I was still devastated - we became friends after her son was killed in an accident . She became like a second mum to me and helped me through some difficult times when my own mum was a long way away.
I was astounded when I was told (not offered) to go to counselling only after a month by my workplace, but gradually I have managed to cope.
Maybe counselling is the way to go or if there is a local Cruse group you can go to.
Maybe forgetting that whole thing of "making memories" or at least pushing it to one side might help and just making the most of any outings, special events etc would help.