Then we walked down the mall, talking of this and that, and later I remembered that her purse was awfully close to my purse. When I headed up the escalator to the food court, she left, saying she just remembered that she was going to the Apple store.
A few hours later I thought back about the episode and remembered that thieves can steal your credit card number simply by being close to your purse - bumping into it if possible.
Am I worried? No. Because my credit cards are in a RDIF protected carrier to prevent theft. And I decided that the reason she originally looked scared when I put my hand into my pocket was because she may have thought I was reaching for a badge.
(she may have gotten the barcode of my library cards, but since there were three of them piled on top of each other, I can't imagine that she'd be able to make any sense of the jumble of numbers.