Dr Clarke says Ms Hand has struggled with Post Traumatic Stress Disorder (PTSD) since the incident in December 2018.
He says she had the classic symptoms where people lose hope, hate themselves and start to drink too much.
Asked to explain PTSD, Dr Clarkes says it is caused by an extremely stressful or terrifying event.
It can cause symptoms including flashbacks, nightmares, severe anxiety, intrusive thoughts, upsetting dreams and nightmares.
It was another reason she has not been able to work since May 2019 he says, because the event happened after a work Christmas party - and people in work knew all about it.
He said people in the street were beginning to know about it because of social media which was extremely triggering for her.
Dr Clarke says other symptoms of PTSD include, blame, shame, guilt and memory problems.
He says not remembering aspects of the traumatic event is an important feature of PTSD.