Sorry. On the face value the comments were for internal pharmacy use only, and they're perfectly justified to let the pharmacy staff know what to expect when dealing with "oddball" customers. If for no other reason, for better customer service.
An obvious accident, unintentional release of those internal notes to the customer itself and her offense at it is the only problem that I can see. Remedied by Walgreens apology and her choosing to fill her prescriptions somewhere else.