Final answer:
The excerpts provided do not contain information about a character named Henrietta complaining about a knot, thus it is not possible to answer the student's question without additional context or reference to the specific work of fiction being discussed.
Step-by-step explanation:
The question 'When did Henrietta first start complaining about a knot?' refers to the specifics of a story or text, not a factual historical event or a concept from another discipline such as mathematics or science. The references provided suggest that this question arises from a work of fiction, likely a play or novel. However, without a direct mention of Henrietta complaining about a knot in the excerpts provided, it's not possible to give an accurate answer to when this event occurred. Therefore, it seems like the student is asking about a particular moment in a story connected to the character Henrietta, but we lack sufficient context to pinpoint the exact moment when she started to complain about a knot.