Here are a few ways the sentence could be continued:

1. The doctor phoned the nurse because she was late for her shift.

2. The doctor phoned the nurse because she was late in administering the patient's medication.

3. The doctor phoned the nurse because she was late responding to an emergency call.

4. The doctor phoned the nurse because she was late getting back from her lunch break.

5. The doctor phoned the nurse because she was late updating the patient's chart.

The continuation would depend on the specific context and details of the situation being described. The key is to provide a logical reason why the doctor phoned the nurse due to her being late.
