Why is Nancy's assessment inaccurate?

Mrs. jones was in a lot of pain. Nancy was distracted and in a hurry. Mrs. jones was distracted about her dog.

A patient in a lot of pain is probably not going to give exact data and pain management should be the first concern. Mrs. jones, in a lot of pain, was concerned about her dog and distracted. Through the pain and her worry, could she have not been paying attention to nancy when nancy asked questions?

Nancy was rushing to get her assessment because of the limited amount of time. Maybe the assessment could have been rescheduled until after mrs. Jones pain medications had set in and nancy had more time?