Good and speedy recovery. Cheers!
Dr has confirmed it's herpes zoster (shingles). Apparently as she's young it's "not dangerous" and should start to scab in a week or so. She's been told to not put cream on it and just to take painkillers and they are not willing to do much else for her atm!
Most likely to be herpes zoster. Do get treated by your physician after confirmation. History as to onset and duration would be most useful here.
Best wishes.