In the Wonder Woman newspaper strip Diana meets Etta for the first time as a patient in the hospital where she works as a nurse. Etta is wasting away, having been unable to eat since an appendectomy. For some reason Diana feels that stuffing her with 10 pounds of chocolates is the answer to her troubles.
Etta obviously takes it to heart when Diana tells her that Wonder Woman says the chocolates are good for her, and thus she starts on a lifelong obsession.
And yet within hours she has ballooned up in what is clearly some kind of allergic reaction, and thus begins a struggle with addiction that lasts for the rest of her life.