Answer:
post-traumatic stress
Explanation:
Post-traumatic stress disorder: In abnormal psychology, the term "post-traumatic stress disorder" is defined as one of the serious mental conditions in which an individual is being triggered by specific "terrifying or horrible" situations or events by witnessing as well as experiencing it.
Symptom: Uncontrollable thoughts, flashbacks, severe anxiety, nightmares related to the event.
In the question above, Karen is most likely to be diagnosed with post-traumatic stress disorder.
