My son had shingles this past summer....he was 3 1/2 at the time. He actually had a mild form of Chicken Pox when he was 7 months old. A child in my other son's pre-school actually came down with the chicken poxs despite being immunized. My pre-schooler seemed to be the "carrier". He (also immunized) had a high fever, two pox marks. The baby also had a high fever and only one pox mark if you can believe that. Me.....no one in my family remembers me ever having it as a child. I had a 105 fever. I thought I was going to die!!!! lol
Because my son's exposure prior to a year old, it predisposes him to have shingles IN CHILDHOOD. He is a VERY HEALTHY child so we were totally shocked.
Your child my have had exposure and it was so mild that you didn't realize it. The only reason I did was because we were told about this other child and to be on the look out.
The shingles rash started on his jaw line and traveled the nerve pathway down his neck, shoulder, arm and hand. He had it for about 1 1/2 weeks and never complained. We had him on a antiviral right away that is used for shingles (forgot the name.) It may be because of that early detection and meds that made it easier on him. Not sure.
The good thing is that the younger you are the less pain and shorter duration of the shingles. The bad news, she may have another flare up in her lifetime. It's rare, but as rare as getting shingles as a child ...the percentages are there. My cousin's wife had shingles twice in her childhood. She said it was not bad.
Good luck. I hope she is better soon.