She said: Feeling sad.

That Last Infernal Prompt

She was the only casualty of the delphic clue
so obscure no other blogger knew quite what to do
with a word like “xiphisternal.” What other site was rude
enough to pose a prompt word so juvenile and crude?

She tried to write a ballad that would win her wide renown.
Instead, the stress of writing it was what brought her down.
That heart attack (her cause of death) was ironically infernal,
for the last pain that she felt on earth was sadly xiphisternal

Prompt words today are juvenile, casualty, ballad, delphic, xiphisternal and down.
To save your looking it up as I was forced to do,  the xiphisternal joint (or xiphisternal symphysis) is a location near the bottom of the sternum, where the body of the sternum and the xiphoid process meet.