So sad π . I am diabetic too and am always worried about loosing a foot or something one day. I have been taking shots for more than 20 years now and it sucks but it could be worse I know. It sounds like your friend should have surgery now before it gets worse, part of a foot or part of a leg sounds easy to decide. Diabetics take forever to heal and if the doctors are saying infection is that deep, well its not good obviously. My prayers go out to your friend and I hope they can get threw this horrible deal.