Pam,
I'm sure Masaki will come in, but just make sure Sonja stays in contact with Dr. I had it as an adult at age 32 after kids had it. At that point, I had never felt so bad, primarily due to low grade fever for a week, in additon to the itching etc. Dr. kept saying "Call me if you get a stiff neck, etc.," I didn't ask why. When it was over, I learned that , in an adult, pneumonia is the least complication, with meningitis and encephalitis also possible. I was fortunate to have none.
I'm not trying to scare you, just be aware. All this was before vaccination available, so probably not as bad now.
Will be thinking of you all; please keep us posted!!