How do we lift the spirit of a loved one who is suffering?

So this is my first blog: I think if I write how I feel each day I can get some peace. My mother has been fighting breast cancer for a second time. When she got breast cancer the first time back in 2000 it was scary and it was hard. But my mother had a mastectomy and had some lymph nodes removed. She did chemo for 8 months and radiation. She went into remission and had been doing great for 10 years. She went in for her 6 month check May 2008 and her doctor stated that she was cancer free and would not need to see her for another year instead of every 6 months. My mother had told her doctor that her elbow seems to always tingle and it was quite bothersome. He sent her to a specialist and they ran some test and did a CT scan and they notices small tumor in her shoulder area. They did a biopsy and they soon diagnosed the tumor as cancerous. This is how my journey began.... It is now 2 years that my mother has been fighting cancer again and this time it has really taken over her body. This time around it has taken so much out of her and my dad...and it's so hard because I feel my hands are tied.

My mother was so happy and enjoyed all her new found friends. They would go workout and go to lunch. They would get together at someone house and just enjoy each other company. My mom was about 170 pounds and full of life. I now miss that person daily and each night I wonder if she will ever come back. She is now struggling to keep weigh on. She is now about 102 pounds and she has no life in her except to keep fighting and to recover from her treatments. The cancer has spread to her bones and 2weeks ago we found out that she had abnormal cell in her spinal fluid. They have began radiation of the brain. She has been having double vision and her eye muscles are weak and she has to wear a patch on one of her eyes. Can this cancer take anymore from her? She has gone 2 years with just bad news nothing good... So I put this question out to any survivor or co-survivor and friends of the family: HOW DOES SOMEONE LIFT THE SPIRIT OF SOMEONE WHO CAN NO LONGER DO IT FOR ONESELF?