is trying to get a receipt for the item she has just purchased, but she can't remember the email it was sent to. What's with Karen's and receipts?
In this case, she decides to give her full name and state that she works for Channel 4, like that means anything. She also tries to flex her Michael Kors bag to show that she has real money, and repeatedly implies that this purchase doesn't really matter to her.
In a part two, the police have been called, (over a receipt), and she seems quite upset that she was filmed. The officer informs her that people have the right to film in a public place, and that if she has a problem she can call Walgreens herself. It's amazing how people causing a disturbance always believe that the police will come to their defense.