I hope things go well for her, and as great strides have been made recently in Oncology perhaps (Please Lord) the chances are good for a total remission. As to viral therapy for cancers, actually the first product along these lines, T-VEC, has been approved for advanced melenoma a (modified H. simplex virus):
Talimogene Laherparepvec (T-VEC): An Intralesional Cancer Immunotherapy for Advanced Melanoma
Forgive if the topic doesn't really fit here, but sometimes there is an overwhelming Need to Know. She has Squamous Cell Carcinoma, which is very responsive to the course of treatments. There is no 100% guarantee, of course, but cure is in the 95+ % ramge