First of all she should been given herpes zoster vaccine to get this prevented. But now she has it go to a infectious disease specialist in lahore there are some brilliant ones in shaukat khanum try anyone: Dr. Ashraf Ali Khan Dr. Faisal Sultan Dr. Yasser Hussain.
The usual treatment consists of anyone of antiherpetic medications: acyclovir, valganciclovir, famciclovir. But only an ID specialist well versed in using these drugs can prescribe correctly and knows how to manage such a case. Along with these pain killers, steroids (controversial use) and anticonvulsants (TCA can be used but is not an anticonvulsant) can be used.
Local treatment of rash consists of lotions and antiseptic creams.
Best advice go to infectious disease specialist immediately for proper management. Here are some articles to read:
Medscape: Medscape Access
Shingles Causes - Mayo Clinic
https://www.nlm.nih.gov/medlineplus/ency/article/000858.htm
If the acute phase has passed then the pain usually remains if the person was not properly treated in acute phase, this pain is called postherpetic neuralgia for that TCA's or anticonvulsants like gabapentin, pregabalin, phenytoin, carbamazepine can be used to decrease pain. Local capsaicin creams may benefit. Again go to a neurologist(dr. moquit usman ittefaq hospital or dr. qasim bashir shaukat khanum) or infectious disease specialist if this is the case.