For which two murders is Mrs. Spence responsible?

Janet Spence from Huxley's "The Gioconda Smile" is
undeniably responsible for the murder of the first Mrs. Hutton (Emily) because she
intentionally poisons Emily by slipping arsenic into her
coffee.

After Mr. Hutton marries one of his other
mistresses, Doris, following Emily's death, Ms. Spence becomes vindictive and spreads
the rumor that Mr. Hutton poisoned his first wife in order to marry his lover Doris. Mr.
Hutton is found guilty of "wilful murder," sentenced to death, and summarily executed.
Thus while Ms. Spence does not personally kill Mr. Hutton, her testimony on the witness
stand and initiation of the rumor about his murdering his wife lead to his unjust
execution.

What is interesting about this story is its
modern relevance. Because of her rumor about Mr. Hutton and his first wife, Ms. Spence
influences Doris (who is pregnant) to attempt suicide. If Doris had been successful in
her attempt--killing herself and her baby--would Ms. Spence have been held accountable
for her death too? The same question is currently being asked in regards to several
"Facebook suicides" that resulted from bullying and cruel Internet postings. "The
Gioconda Smile" and recent current events make society consider the definition of
"murder."