I think her obsessing so hard over calories is exactly what is causing her to fail. If she would just focus on eating healthier options and smaller portions the weight would fall off. And you're absolutely right. 3000 calories is literally half of what she consumes now and if she had that much (which is still a lot but less than what she currently intakes) she would lose. But I guess she's too stupid to put two and two together, or she's so sure that she "knows what shes doing" even though it never works.