Behavioral changes - Resists treatment.

This pattern—social withdrawal, suspiciousness, fixed beliefs about the cook, and occasional disorganized conversations after a major trauma—suggests a possible psychotic spectrum condition (likely trauma-triggered or evolving psychosis) rather than just grief, and it needs psychiatric evaluation; since she is resistant, avoid directly labeling it as “mental illness” or forcing treatment, instead approach her with concern for stress, sleep, or anxiety (e.g., “you seem tense, let’s just talk to a doctor to feel better”), keep communication calm and non-confrontational, do not argue with her beliefs but gently acknowledge her feelings, ensure basic structure (sleep, routine, reduced isolation), and involve your father in maintaining a low-stress environment; if symptoms escalate (severe paranoia, aggression, self-neglect), a home consultation or indirect referral via a local psychiatrist may be needed, as early treatment significantly improves outcomes.

It might be the oc features which got perpetuated by the trauma

consult

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Hi Your sister’s changes seem to have started after a major trauma, and while she is functioning in daily tasks, the social withdrawal, suspicious thoughts, zoning out, and difficulty in conversations suggest that her mind is under significant psychological strain. The beliefs about the cook and excessive caution around sharing information point toward emerging paranoia or trauma related mistrust, rather than just normal anxiety or grief. Since this has been persistent for 3 years and is affecting her thinking and social life, it would be important to rule out conditions like trauma related disorders or early psychosis, especially because insight is low and she is resisting help. The immediate focus should not be forcing therapy but building trust and reducing resistance. Avoid directly challenging her beliefs or labeling them as wrong, as that can increase defensiveness. Instead, validate her emotions and gradually introduce the idea of support in a non threatening way, such as suggesting stress or sleep related help rather than “mental health treatment.” Involve your father to maintain a calm, non confrontational environment and observe for any worsening signs like increased isolation, strong fixed beliefs, or neglect of self care. If possible, arrange a gentle psychiatric evaluation under the pretext of general health. Early intervention is important here, and even if she resists initially, consistent supportive engagement from family can slowly open the door for help.