Andrea moved her cart full of junk food into the checkout line. This was at least fifteen minutes later and since she hadn't made another wish, Jon still hadn't pinpointed the current link in the wish chain, which was Andrea.
So, she ended up going back outside to help her mom with the car. All it took was one wish to make the car appear there and her mom got in and left, leaving Jon in the parking lot. He still had find the current link. But it could be anyone or anywhere.
Fortunately, he decided to go back in the store. And that's when he noticed another change in reality.
Andrea was moving up the line and everything seemed fine. Until a snobby (yet attractive) woman threw an insult at her, calling her a cow, among other things. Andrea was so infuriated that she yelled out "I wish ..."