You might want to read the part where she had paid for her purchase and showed her receipt to a store employee before you post such tripe.
“She shook her head at me and pointed at the line”
You might want to read the above sentence.
The employee in question obviously didn’t even look at the receipt, and was immediately rejecting what she was trying to do. Why? Nobody knows, and I surely don’t care, but this is what the employee did.
They have a process—if you’re in too much of a hurry— then wait until you can be held up for 5 minutes.