how long do we have

hi i would like to know how much longer do we have. Here is the back story. my aunt was diagnosed stage 4 breast cancer in January 2011 with mets to lymph nodes under right arm, bones, lungs and spline. also she was born with cerebral palsy and epilepsy .she was put on femara and it worked until December when we noticed her cancer antigen level rose and a tumor grew on her eye socket behind her right eye and progression to the liver. she was then changed to faslodex after 3 months it was decided that faslodex was not working because of additional tumors in lungs, on bones and liver and the lymph nodes in abdomen and under left arm. next was chemo (navelbine), we were told that it was the lightest chemo drug for her affected areas and she was not a candidate for a few others because of the cerebral palsy and epilepsy. It hit her so hard her temp and blood pressure dropped she had severe muscle spasms to the point that she couldn't stand on her own she had to be hospitalized for over a week. It was decided that since chemo was for palliative care and wouldn't cure her or drastically extend the time that she was here chemo was no longer an option. she is now on a new estrogen blocker but we know it wont stop the cancer we are hoping it will slow it down hospice was not a option in my book because given her mental abilities she would just give up. but im still praying for a miracle. the doctors wont give us a time frame i know nothing is set in stone but a general idea would help. So does anybody have a general idea on how long we have? sorry for the long synopsis but i wanted you all to have the all the pieces to the puzzle .

Thank you