What can I do to help my girlfriend get over a death?

I am sorry to hear of her loss, especially being her mother. She is experiencing trauma, she not only needs to find a way to survive this loss but in a way she was also abandoned by her mother. Not intentionally but in a way technically. The loss has created a huge hole in her life. The pain in her heart and the questions she has are beyond any words. She is blessed to have you near to care. You need to find a way in which to have her get medical attention. Take her to a doctor so she may get the care she needs. She is trying to cope with something that is beyond her control. I know because I have been there. I lost my family when I was 9. Help her get medical care and counseling that help balance such moments in our lives. There are stages we must go through to cope and survive help her with the healing.