April 9, 1918 - Depression

Today was a particularly depressed mood day for Mary.  She went to work but was very tearful for no particular reason that she could determine.  Depression, aka melancholia, was poorly understood in 1918.  German psychiatrist Emil Kraepelin described depression in the late 1800s as a chronic and recurrent disease.  Sigmund Freud in his 1917 Mourning and Melancholia paper compares the similarities and differences of mourning as a normal process due to loss and melancholia as a pathological state.

As far as I can determine, except for more extreme measures such as electroconvulsive therapy or surgical lobotomy, treatment for depression in 1918 was very limited.

So, did Mary suffer from depression or was she still grieving the death of her mother in 1910, the death of her oldest sister in 1914, and the absence of her soldier boyfriend fighting in France?  Or was April 9 a particularly depressing day because of the rainy weather and the fact that Mary had to work despite the appearance of at least one of her most favorite movie stars, Mary Pickford, along with Charlie Chaplin and Douglas Fairbanks in Philadelphia that day to promote the Liberty Loan campaign?