You could verify the cause of death by getting a death certificate. It probably would not list the reason for why she did it.
Oregonian, April 7, 1937 Page 13
Harrington- at 1920 NW 26th Ave. April 5, Vera Lucille Harrington, age 28 years; beloved wife of Arthur Harrington, mother of Lorraine and Arthur Jr. Harrington; daughter of Mr. and Mrs. George Regan, sister of Mrs. Alin Meyer, Delmer and William Millican, and Edward Regan and Mrs. Gladys Goldblatt, San Francisco, Cal. Remains at the Parlors of Miller and Tracey. Notice of Funeral later.