Difficult customer

At work, I went into the back to wash my hands and headed into the office to heat the clam chowder in the microwave. I came out of the office with the chowder a couple minutes later to discover a customer standing at the counter! She told me that "you walked right by me! and I wondered if you can hear." I honestly didn't see or hear her or I wouldn't have walked by her. She wanted to look at funeral arrangements, so I brought our website up. Of course twice she told me that I was scrolling too fast. I forgot the scripts on the order and had to reprint the receipts. She complained about the difficulty getting into the flower shop. I turned down the radio and am staying up front so I can see if a customer comes in. However it is necessary to go into the office periodically and there is always the chance someone could come in.