has your mom gone off her meds? If so, get her to a dr and get her back on them. Its hard dealing with a person that is going thru this kind of mental trauma. They have a hard time seeing past their own feeling to see how they are affecting everyone else who is also dealing withthe lose and them.
Know this is not your mom her emotional issues have gotten the best of her. Contact a mental health counsellor maybe for some advice to see how to help calm her down. if there is a schizophrenic mental health society they may have free couselling to help her deal with this tramatic loss.
my heart goes out to your family