Last year, Hannah witnessed an accident where a pedestrian was struck and killed by an automobile. Since the accident, Hannah has experienced anxiety and actively avoids the street where she witnessed the accident. A clinician might diagnose Hannah as having.

A clinician might diagnose Hannah as having PTSD (Post Traumatic Stress Disorder)

Explanation:

This is a mental health condition that people who have passed through or witnessed a terrifying event in the past. PSTD can occur to the person experiencing it through series of nightmares and/or flashbacks.

What Hannah is going through perfectly fits the above description.

PSTD can be treated through medication and counseling.

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