I guess this belongs in the low carb war zone area I just have a question,

A dear friend of mine who is slim and active but not overly active (she's doesn't go to the gym but she does walk alot and she takes dance classes
like 4 times a week) but when I look in her kitchen it's mostly carbs.
She eats hardly any protein mostly fish and eggs but her fridge has low fat milk, full fat greek yogurt, berries, broccoli, lettuce,tomates,apricots, I noticed she eats ground flaxseeds as well.

She eats whole grain bread with real butter ( I noticed the only low fat thing was the milk) steel cut oats. Anyway, thats about all I could see until she wondered what was taking me so long to get a drink of water!
How can she eat like this and still be thin? Oh, and she drinks wine almost
everynight too! When I ask her she says its thats shes active but there I go to the gym 3 times a weeks and take classes that make sweat and I'm keeping my carbs low but I feel like I'm missing something here.

Anyone have any answers for me?