i read it as she was actually doing ok (although she had no idea why--no idea what constituted activity/caloric intake), it was her friend who was a fatty. My mom's kind of the same. She is super active, but underestimates her level of activity because she has no idea what her BMR is or TDEE, and then also underestimates how much she eats, but in the end it all evens out because she doesnt really overeat. She just does everything misinformed. As in, we went on a 2 or 3 hour hike that was moderate level of working out (as in, didn't sweat, but had the sun been out, there would have been sweating) and she guesstimated that we burned like 50 calories.