I also suffer from healing problems. Before I got RSD, I used to heal very fast - if I cut my knee, the cut would be fully healed with a few days at the most etc. Now that I have RSD though, everything takes so much longer to heal up! I had an ingrown toenail removed last year on my RSD leg and it took a lot longer than it would in a normal person for the incision to heal - even though it was only fairly small!! I also had a really nasty case of Cellulitus just before Christmas and that was awful - my Pain Management Doctor kept saying that it would go away within a week or so but it didn't and I ended up needed a really strong course on antibiotics to get rid of it. I still have some scarring now from where the Cellulitus was.
Now that I have RSD, I always seem to get more infections also. I'm not sure why, but I am more prone to things like Cellulitus - I never had it before I developed RSD and have had it at least 2-3 times now!
I'm sorry to hear about everything that your friend is going through. I really wish that I could help her more but I don't have any answers unfortunately. Just know that I care and send her my love. Please keep us all updated when you can!