Hi,
Have your grandmother check with her doctor about silvadine (spelling is probably wrong). My husband had 2nd and 3rd degree burns and that's what they gave him. He was burned with boiling water, and I don't know if radiation burns are different. When I did radiation, I used the Aquaphor ointment. Did they stop radiating your grandmother? Aren't they supposed to monitor at least once a week? Poor her!! Such an uncomfortable spot to suffer in. I hope she's better soon.