How can you tell if your sister is a narcissist?

Answer 1

Most narcissists are male and don't manifest themselves until late teens or early adulthood. However here are some things to look for, you can find this on www.mentalhealth.com
A pervasive pattern of grandiosity (in fantasy or behavior), need for admiration, and lack of empathy, beginning by early adulthood and present in a variety of contexts, as indicated by five (or more) of the following:

1. has a grandiose sense of self-importance (e.g., exaggerates achievements and talents, expects to be recognized as superior without commensurate achievements)
2. is preoccupied with fantasies of unlimited success, power, brilliance, beauty, or ideal love
3. believes that he or she is "special" and unique and can only be understood by, or should associate with, other special or high-status people (or institutions)
4. requires excessive admiration
5. has a sense of entitlement, i.e., unreasonable expectations of especially favorable treatment or automatic compliance with his or her expectations
6. is interpersonally exploitative, i.e., takes advantage of others to achieve his or her own ends
7. lacks empathy: is unwilling to recognize or identify with the feelings and needs of others
8. is often envious of others or believes that others are envious of him or her
9. shows arrogant, haughty behaviors or attitudes

Please note that you cannot base her behavior towards you as a way to diagnose her. Siblings will always treat each other a little differently than others. You must look at how she is in her everyday life with friends and strangers. If you suspect that she is, try to get her to go to a mental health professional, there is no cure... only manageability.

Answer 2

By the way she acts