Depending on who was late, the sentence's meaning changes based on the context:

* **If the nurse was late:** "The doctor phoned the nurse because she was late for her shift and the patients were waiting."
* **If the doctor was late:** "The doctor phoned the nurse because she was late for their meeting and needed to apologize for the delay."

Because the pronoun "she" is grammatically ambiguous in this sentence, it is a classic example of a **Winograd Schema**, where the reader's interpretation often depends on real-world assumptions rather than the structure of the sentence itself.
