I'm sorry to hear about your baby and Mom.
I just lost my Mom exactly a month ago. I know how hard it is. Right now, spend as much time with her as you can and tell her how much you love her. Even if you don't think she hears you, keep telling her. Hold her hand and talk to her.
Try to keep some hope because cancer is unpredictable and sometimes when things look bad, it can change into something better.