The only way to not get the flu is to not ingest the virus into your system. Keeping your hands a face clean (Lysol wipes) and stay out of sick peoples’ faces is how you do this. Vitamin ABCD-XYZ is not going to save you from the flu. But, having a healthy immune system can shorten the duration by quickly “learning” to attack the virus. The only fail safe is the correct flu shot, and then only a week to ten days after receiving it.
IIRC, it's only been since 2009 that flu has emerged as the number one danger connected to death by pneumonia but the fact of the matter is there is a long list of pneumonia causes including STD's, specifically chlamydia.
2009, if that year is correct, marks the pharma industry's push to inoculate and inoculation does provide a pathway of many laboratory life forms capable of squeezing through the opening at the end of that needle.
The subject of all the pity generated by the designing press should have stayed in mexico. As eastexsteve mentions, The only way to not get the flu is to not ingest the virus into your system.
Her lifestyle as the article indicates opened her to many opportunities of life destroying pneumonia, not just the flu. To me, she's just another example of culture clash. Except in her case, she's the one that paid dearly.