I am a twice breast cancer survivor. I am proud of the pink ribbon, etc. I beat the disease. As a cancer volunteer, I find that some women do not want others to know about their disease. A bright colorful quilt would cheer them. I made several and put fleece on the back with a low loft poly batting because chemo rooms are sometimes very cold.
Most of all bring your friend a meal and just be there, laugh with her, cry with her, do errands if needed.