Ask her to fix her slouched position, and ask if she feels different about herself now. The expected answer would be yes: At first, the patient might be uncomfortable, as they have been slouching for a while now, and they were used to “hiding themselves” instead of standing tall and confident. This feeling of change will be idententified and then explained. The most accurate diagnosis of this would be any mental disorder relating to “distorted self image”, “depression”, or “insecurity”
