You are not alone and it isn't unusual. I think it is protective. Your brain is giving you the time to deal with all the practical things you need to.

I lost my mum six years ago to pancreatic cancer. I remember feeling nothing for a few weeks - I couldn't feel sad, I couldn't feel happy. I just felt numb. Then the sadness came and for a while all I could think of was the trauma of her last few weeks, but little by little those memories were replaced by the happy ones and that's how I remember her now. 

however you feel, whenever you feel it is okay. Dont judge yourself for not feeling like others do. She will be with you the rest of your life and you will miss her the rest of your life, but your love will carry you on. Take good and gentle care of yourself. 

Im so sorry for your loss thank you for your kind words of support. My mum too had pancreatic cancer . Like yourself the trauma of the last few weeks and feeling helpless as there was nothing I could do to help . Take care of yourself too x

Same with my Mum who died in March 6 weeks after diagnosis. Pancreatic cancer is horrible and those of us who took care of our loved ones in the last month go through terrible trauma which no-one on the 'outside' can really understand.