Hello my question is about personality disorders. I believe my sister in law suffers from one. Her symptoms however show traits from two different typ?

Traits. She may not have a diagnosable personality disorder. She can, however, exhibit traits from one or more personality disorders even if full criteria is not met for a diagnosis. She may also have a concurrent mental illness and a personality disorder. Many possibilities, only her psychologist or psychiatrist can positively diagnose her.
There is such as. Thing as a mixed personality disorder (personality disorder not otherwise specified). However, when one who isn't trained attempts to diagnose personality disorders in relatives- the results may not be accurate.