In a court order issued on Friday, New York District Judge Katherine Forrest rejected Trump's assertion that she should be exempted from having to appear at a deposition in the case, because of the demands on her time as a senior White House official.
Despite "the obvious time constraints that Ms. Trump must currently have... it is nonetheless true that she is alleged to have personal involvement in the events at issue in this lawsuit," Judge Forrest wrote in her three-page ruling.
"Accordingly, she cannot avoid a deposition in this matter."
The court limited the time of the deposition to just two hours, however, and ruled that it must take place in Washington by October of this year.
The luxury brand Aquazzura last year filed a federal complaint against Ivanka Trump and her manufacturer, Marc Fisher Footwear, for trade dress infringement, unfair competition and deceptive trade practices.
Her manufacturer has flatly rejected the charge.
Aquazzura's "Wild Thing" shoe was an immediate success, becoming the signature stiletto of stars including actress Jamie Chung, singer Solange Knowles -- Beyonce's sister -- and model Kendall Jenner, selling in the United States for $785.
Ivanka Trump's "Hettie" style, which the Italian brand said copies the design of their shoe, costs $145.
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