A few weeks ago my ex mum in law died. I was with her when she passed away. I loved her very much.
One of the first things I did afterwards was re-evaluate my life, sunk into great depression, cut off all who tried to comfort me, dumped my boyfriend of 5 yrs, refused to answer the phone when my own mother rang......
What I am saying is this. Give her time to grieve in her own way. If she does not want/will not accept your offers of comfort etc. Leave her be.
This will sound harsh, but her bereavement may have made her realise that you are not the man for her, or she may just need to keep the emotional barriers up for a while and come back to you when she is not so 'needy' (which, for some - like me - when they are feeling 'needy' they back off and withdraw into their shell until those 'needy' feelings pass).
I hope it all works out well for you.