15YO DD made some bad choices during her walk and as a result she has suffered greatly. Water got inside her boots, she wore the wrong socks, and didn't tell a member of staff for 2 days. Her feel look like she's been walking with cheese graters inside her boots. The skin has completely come off the back of her little toes and there are other patches or open blisters, raw skin. We've cleaned the area, applied a thin layer of sudocrem, I have given her some paracetamol What else can I do to help her feet heal as quickly as possible and avoid infection?