Hello...I was recently diagnosed with Stage 1 oral cancer. But twelve years ago I had breast cancer that had spread during my pregnancy and was only given a 5% chance of surviving with very aggressive treatment. Here I am twelve years later, and I went on to have another child.
Recurring so soon after the initial cancer is a really tough situation. Are you friend's doctors (especially oncologist) connected with a major cancer treatment center? Like others have suggested, quickly geting into an appropriate clinical trial is the best shot at saving her life - even if it means traveling to another state!
Also, a cancer support group will help your friend deal with all the issues she is facing. It sounds morbid, but believe me, talking to other cancer patients can really help her because they know what she is going through. Another post also suggested anti-depressants, and they can also help with the overwhelming emotional stuff right now.
Please stay supportive of your friend. She needs you, and don't forget there are support groups for caregivers and friends of cancer patients. Take care of yourself, too. Please encourage her - whether she has months, years or decades - to take the gift of time she does has and not let cancer take away the joy that still can be found in life.