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There are many other personality disorders which share some traits with Rad. Eg narcissistic personality disorder, Antisocial personality disorder, sociopathy, Borderline Personality Disorder etc.
My friends sister is just as you describe and comes from a loving family too, she has Borderline personality disorder.
You could try this test for your sister.
[url=http://www.4degreez.com/misc/personality_disorder_test.mv]Personality Disorder Test - Personality Test[/url]