Amby,
I suggest that you read/ view youtube videos on differences between 'High Context' vs "low Context" societies.
I would love to see you change your generalization of whole race based on your experience.
Germany and west in general is a low context society and as someone who grew in high context society, her action might come as offensive to you.
If you can understand this difference and try to understand where she comes from, it might help you communicate slightly better.
As a business owner, I believe, it is your obligation to your business to understand the customer and try to gain more of them.