I wanted to share a group I found recently, Feel Better Friends. This is a group devoted to making dolls for children with cancer. These are all volunteers who make custom dolls. They match dolls to requests whenever possible.
What is also unique about the dolls is you can request a doll with a removable wig so the child truly has a twin. Imagine holding on to something while undergoing procedures that is unique like you. It has to be a great comfort.
I have joined the group which has a wonderful facebook page. I encourage all my crochet buddies to get behind this project. There is a section that answers all you questions so check it out.