So, the vocabulary word of the day, thanks to Coralie (and dictionary.com), is:
a bitter, sharply abusive denunciation, attack, or criticism:
A bitter, abusive denunciation.
Word History: Listening to a lengthy diatribe may seem like a waste of time, an attitude for which there is some etymological justification. The Greek word diatribē, the ultimate source of our word, is derived from the verb diatrībein, made up of the prefix dia-, "completely," and trībein, "to rub," "to wear away, spend, or waste time," "to be busy." The verb diatrībein meant "to rub hard," "to spend or waste time," and the noun diatribē meant "wearing away of time, amusement, serious occupation, study," as well as "discourse, short ethical treatise or lecture, debate, argument." It is the serious occupation of time in discourse, lecture, and debate that gave us the first use of diatribe recorded in English (1581), in the now archaic sense "discourse, critical dissertation." The critical element of this kind of diatribe must often have been uppermost, explaining the origin of the current sense of diatribe, "a bitter criticism."
Let me clear things up to say that she wasn't using this word in any way other than in titling her own words to me through her IM.