A nurse practitioner (Masters or Ph.D) is also a nurse, they can just do a lot more than other types of nurses. A nurse is just someone trained to provide medical care who is not a doctor. They can work on their own, or with a doctor, though they are usually more limited in the types of care they can provide vs a doctor.

So calling her a nurse is completely accurate. She went to nursing school, not medical school, so she’s a nurse, not a doctor.