breast cancer that is metastasis to soft tissue sarcoma

Hello Every one!
my mother got diagnosed with breast cancer 2yrs ago. she went through radiation followed by Mastectomy and chemo. However, now her cancer is back and her doctor thinks it is soft tissue sarcoma. the sarcoma is spread almost all over her body and we are very much so worried for her life. If anybody is going through is kind of condition or had been diagnosed before, I really want to hear your side of the story.
God bless you all