Means nothing, i can eat pizza and burgers all day long yet be in a caloric deficit and lose weight, or i can eat pizza and burgers and lean bulk. It's all how you manipulate the calories.
Was she tracking her calories? Was she adjusting her maintenance and deficit level for her level of exercise? Maybe the has a thyroid issue that she/you are not aware of. There's lots of stuff that might effect the outcome here. Very tough to find an accurate answer via a message board.