I know a woman who hasn’t been depressed for 4 years. After a month into the First Place for Women(Christian) diet she’s become really depressed. Another woman is experiencing this too.
Why and how a diet could make you depressed?
I am not familiar with this diet but any diet that "forbids" certain foods can cause depression or even an obsession with the forbidden foods. Just make sure your firend is on a nutritionally balanced program before looking into other possible causes for her depression.

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If you eat food you dont enjoy long enough you start to miss those foods you do enjoy. Also, a lot of "health" foods are not so healthy after all. For all I know she could be eating junk food disguised as health food.
Sometimes a cheat meal is good because it keeps a person sane and on the wagon.
References :
Im not sure about the diet these women are on, but a lack of nutrients can cause imbalances in our bodies, ultimately causing depression. We need a sufficient amount of nutrients and vitamins that we receive through consumption to sustain a healthy mood. This is why diets are not healthy. They deprive us of what our body needs to function properly.
References :
I am not familiar with this diet but any diet that "forbids" certain foods can cause depression or even an obsession with the forbidden foods. Just make sure your firend is on a nutritionally balanced program before looking into other possible causes for her depression.
References :