I doubt she was buying for the same person eight times a year—more likely for a half-dozen people once or twice a year, which might include her kids, parents, siblings, or other people who are part of her family but not of her household. One person getting two colds a year is certainly not impossible, especially if they’re living with school-aged children, who tend to bring home a sample or two of every virus circulating in the region. Plus, some people are more susceptible to this stuff than others.