Tubes tied and burned

What are the chances of pregnancy? I know someone who has had 2 positives on a test but her friend had a negative. Even at a doctor appointment maybe a month ago it was positive, retook and they said it was negative. Now she has had 2 positives today and yesterday. What could this be?

Not sure where to post this... btw she's 39.

Oh and she's had them tired and burned for 15? Maybe 16 years.