Set boundaries: Boundaries are essential in any relationship, but particularly with narcissistic individuals. Let your sister in law know what behaviors you will not tolerate and be firm in enforcing those boundaries. For example, you might decide not to discuss certain sensitive topics or to limit your interactions with her to certain contexts.
Don't take it personally: It can be difficult not to take narcissistic behaviors personally, but it's important to remember that they are a reflection of her own issues, not a statement about you. Try to detach yourself emotionally from her words and actions and focus on your own well-being.
Seek support: Talking to a therapist or trusted friend or family member about your experiences can help you process your feelings and develop coping strategies.
Focus on the positive: Try to focus on the positive aspects of your life and relationships rather than dwelling on the negative interactions with your sister in law. Spend time with people who support and uplift you, and engage in activities that bring you joy and fulfilment.
Avoid conflict: As much as possible, avoid getting drawn into conflicts with your sister in law. If a disagreement arises, try to stay calm and objective, and focus on finding a mutually acceptable solution. If the conflict becomes too intense, consider disengaging from the situation.
Lead by example: Sometimes, the best way to deal with a narcissistic individual is to lead by example. Show her what healthy behaviours and interactions look like by treating her with kindness and respect, even when it can be difficult.
Remember, you cannot control your sister-in-law behaviour but you can control how you respond to it. Prioritize your own well-being and seek out support when needed.