It’s not hard to figure out what happened if you read the entire story and put a couple of things together.
(1) She went through the drive through at 3:50 AM in a taxi. The story does not say she was the taxi driver—it appears more likely she was the passenger.
(2) She ordered something not available (they were only ser ving breakfast at the time). The employee is “surley” at her (through the drive through speaker).
(3) So she orders breakfast, but once again orders something not on the menu. The employee is yelling at her (through the drive through speaker).
(4) On her third try, she finally orders something on the menu.
(5) She pulls up, the employee screams at her, and spits in her face.
Reading between the lines: she was drunk and taking a taxi home. She tells the taxi driver to pull through McDonalds so she can get some food. She is so drunk that she and the employee can barley communicate through the speaker, so the employee starts to speak as loudly as they can to help her hear. She takes this as yelling at her, and tells the employee off (probably starting with “I don’t care what time it is, I want a cheesburger”). When she gets to the window, the employee then tells her off.
You nailed this one precisely. And I’ll bet the company ends up giving her something to shut her up.