After experiencing trauma two years ago, Brianna is showing signs of which disorder?

Brianna is displaying signs of post-traumatic stress disorder (PTSD) as it typically manifests after an individual has experienced or witnessed a traumatic event. The timeline is crucial here; PTSD is characterized by the persistence of symptoms for more than one month after the trauma and can occur anytime after the event. Since Brianna experienced trauma two years ago and is now showing signs consistent with PTSD, this aligns well with the disorder's criteria.

Individuals with PTSD commonly experience a range of symptoms, including intrusive thoughts about the traumatic event, avoidance of reminders associated with the trauma, negative changes in mood or cognition, and heightened arousal symptoms. These are indicative of a prolonged reaction to trauma, which distinguishes PTSD from other anxiety disorders or mood disorders.

In contrast, acute stress disorder occurs within the first month after the traumatic event, making it an unlikely candidate for Brianna's condition given that it has been two years since her experience. Other disorders like generalized anxiety disorder and major depressive disorder have different symptom profiles and timelines that do not align with Brianna's history of trauma or the time elapsed since her traumatic experience.