Your first mistake was looking at the web site and the second was ordering something. When you did that you became a customer. I know you were being nice but you changed the relationship. Now it will take total honesty to get things back to being a friend. Tell her as a friend in a very frank tone that you cannot afford her products and won't be ordering anything in the future. Then tell her that you value the friendship and don't want her business to ruin it. Let her know that you don't like talking about the business but you don't want to hurt her feelings. This is the way to avoid ruining the relationship. You have to be honest but direct but also kind. Try this next time you speak and get things back on track.
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Thank you! Here is what I said:
Hi Diane, I just wanted to let you know I appreciate you letting me know about the vitamins for my eyes from your website. I feel they're a good product and helped my eyes. However, now that I am working only part time and our company has cut everyone's pay, I won't be able to afford your products anymore, as they are out of my price range; so I won't be ordering anything in the future. When I do need vitamins or some other product, I will have to make-do with bargain brands from Wal-Mart. Thanks for your understanding and thanks again for thinking of me. Gina