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"Samantha, who has accused Meghan of having 'narcissistic personality disorder"'

https://www.healthline.com/health/na...ality-disorder
Narcissistic personality disorder (NPD) is a personality disorder in which people have an inflated opinion of themselves. They also have an intense need for the admiration and attention of others.
People with NPD may be generally unhappy and disappointed when they’re not given the praise or special favors they believe they deserve. Others may see them as snobbish and conceited, and may not enjoy being around them.
NPD can cause problems in many areas of life, including:
work
school
relationships