Diet Tips

A friend of mine has been dieting for a year now and we haven’t seen her eat any carbohydrates for breakfast or lunch since then.
Two weeks ago, she drew a mark on to her arm (with a pen, not that important) and the mark still hasn’t vanished yet. Her skin looks very pale and unhealthy.
She’s very touchy about the subject of weight.
How would you suggest us to get her to eat properly again?

Is this true that foods with no carbohydrates can’t make you gain fat? Or is this only true to an extent, or is it a myth? I’m on a diet restricting all carbohydrates. Is it bad for me? How many calories should I eat a day on this diet? The same normal amount I usually would? Or more? Maybe even less..? Explanations please!