The idea is that as her husband is a billionaire, she had access to better healthcare and more likely to undergo screening. I know many breast cancer patients from India and almost none of them underwent regular screening, and as a result all of them caught the disease as it had progressed a lot more than the case of Seema. As she had access to regular screening, and got diagnosed at a earlier stage, her prognosis was a lot better than for the average upper class Indian with access to quality medical insurance. You must also consider the fact that most medical insurance in India dont cover breast cancer screening.