Thanks for your question on Health Care Magic. 
I can understand your concern. 
In my opinion, your friend is having stress, 
anxiety and 
depression related 
chest pain. 
She had gone through emotional breakdown (death of mother) and this can cause stress, anxiety and depression. 
Her symptoms like chest pain, crying etc also favour depression and anxiety more. 
So better to 
consult psychiatrist and get done 
counselling sessions. 
She needs antidepressants and anxiolytic drugs. 
Counselling plays very important role along with drugs for control of depression and anxiety. 
Once these things get controlled, her chest pain William also subside. 
Don't worry, she will be alright. 
Hope I have solved your query. I will be happy to help you further. Wishing good health to your friend. Thanks.