This is Dr. David
yes, there are rare cases of herpes virus attacking the brain and causing encephalitis
she needs to see a doctor right away and get her brain evaluated
she may need a brain MRI scan and a spinal tap
she should consult with a neurologist about her new dementia symptoms
only after testing can we tell what may be causing her dementia
she may benefit from antiviral treatment to help fight her shingles virus infection.
let me know if you have other questions.
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it doesn't sound like she has had any testing yet to find out what is causing her dementia
without testing, it is impossible to know how your dementia will progress or if it is reversible with treatment
some dementias can be reversible with treatment.