Hugs and prayers to you and your mother. Speak with her oncology team and if possible a hospital social worker, to find out what options are available. I too was diagnosed with Breast Cancer in 2010, and it spread to my liver last year. I was being treated with Carbo, Gemzar and Avastin from July through Jan- in that time my BC lesion was reduced by almost 70% and my kidney cancer lesions shrunk a bit after being stable for 3 years.
Your mom's wishes, how much pain she is in and her quality of life should be taken into consideration. You may also want to ask about clinical trials.
Good luck and please keep us posted.