I am not discussing whether this matter is a crime or not, only whether this needs to be disclosed or not. The information you gave is inconclusive about this issue however there are signs that it may be so. You mentioned being in court, and having paid money to a court clerk so there is a court record. You don't have to go into a court room or see a judge to have a court record, it is created the moment any case is filed and then is retained and searchable by anyone. It will continue to exist on the court's index file even if the case was dismissed.
I'm not sure what you have exactly told the immigration officer over the phone, but I suspect you have not mentioned being in court otherwise you'd be told to lookup the court records.
You mentioned having disclosed this matter to IRCC and the application was subsequently approved. This means one of two:
(a) IRCC attempted to search for information and found records corroborating the applicant's story and then determined she was admissible.
(b) IRCC attempted to search for information but found no records at all only what they have on file from the applicant's declaration and then determined she was admissible based on the declared facts.
Now, regarding the question on landing. You are free to say whatever you wish. I usually refrain from answering questions about misrepresentations but in your case, since you insist on knowing, it is not a material misrepresentation because the information is already on file and the correct procedures have already been carried out. The officer does not have to record your answers anyways you only have to initial your name on the landing document.