To be fair to her, she didn’t know what to do

I agree but it’s been shown that simple tactics like releasing fruit scent (melon particularly) can increase sales by as much as 10%. I’m not sure if it’s known exactly why this occurs but you can see why a shop would try various methods to increase their sales. Maybe altering the layout makes enough people change their habits to increase sales that it’s worth confusing/irritating those who aren’t affected by it?

Costa is a national treasure