I know its a very hard situation to come over. But you can check at our local hospital or a counselor to help you with the grieving process. Curches have alot of groups for recovery. Thats your best bet right there. You should not her death but celebrate the life she live and what she taught you. You need to get used to the fact that she lived her life and her time has come to go to a better place. Realize shes watching you from above and will be with you in spirit. Heres a story I once heard:

theres this place in heaven where everything is white and beautiful. With a garden and waterfalls, all campletely amazing. All the people are there and everyday they go for a walk with god, holding his hand, each one holding a lit candle. Well there was this young lady that always stayed behind and would never join the others on their walk with god. One day they all came over asked her "why dont you ever join us on our walk with god?" and the lady looked at them and said "well I want to go on the walk but every time I light my canlde to go, my sons tears blow out my candle and I cant go"

please let your tears dry and let your mother be happy with god.