There is a site dated September 9, 2011, mastectomy pillow instructions. I have used this site for pillows for friends and it really has great visual and printed instructions. The pillow has a pouch so it can be used for a warm/cold packs for swelling, etc. The bag is a shoulder type, fits nicely under a light jacket and not really noticable. I needed one for a lumpectomy I had and it really was a great comfort, in bed or just sitting, it keep you comfortable.
I also made a single bed quilt for a friend who is 4 ft. 11 in. and use both cotton on top and back. I light batting for the centre. She said it was comfortable and warm. Hope this helps. Your friend will appreciate your efforts. Marge