Where are the control groups? Shouldn't there also be at least a few of these:
1) One group that showers daily and uses the spray.
2) One group that showers daily and sprays plain water.
3) One group that doesn't shower for 4 weeks and sprays plain water.
Number 3 is almost required for any accurate study and I would think it would
the other 2 wouldn't hurt either.
Reading the article, she was subject 26 of who knows how many. For all we know, she was in the control group, or there may have been separate control groups present. The article recaps her personal experience, not the complete conditions for the experiment. Maybe with the initial findings, they'll do multiple rounds with different variables as you suggest above.