If the breast cancer was caused by a virus, how did she acquire that virus in the first place?

While you are not liking this answer, we must answer a direct question truthfully, that this was instilled by the interlopers into one of the vaccines she received for Covid-19. Not the first, but a subsequent follow-up booster around the same time as we told you they were doctoring some lots of vaccine with viruses that cause autoimmune disorders. But the same viruses can also cause malignancy, and while this has a lower incidence, it is still a highly significant cause of problems for many, because the consequences can be fatal and not just a long-term chronic illness.