“Initially, Ivanka seemed like the most rational and sane one of the bunch,” said 29-year-old Lindsey Ledford, a student at the University of Maryland University College. After Ms. Trump tweeted the link to the dress she wore at the Republican convention, Ms. Ledford visited Ms. Trump’s social media platforms and website. “So in that sense it worked,” said Ms. Ledford. But shortly after the “Access Hollywood” tape was released, Ms. Ledford joined the #GrabYourWallet campaign, saying that seeing the Trump name on apparel was “like a slap in the face.”

At the beginning of her father’s campaign, Ms. Trump had some plausible deniability that she was anything less than a heartfelt advocate for women, even if she was doing it under the aegis of her commercial brand and profiting from the exposure. But in the last month, she has violated the terms of mercantile feminism that are unspoken but clearly understood by both the buyers and the sellers.

As it turns out, allegations of sexual assault and mercantile feminism do not mix very well. Mr. Trump now represents something that’s offensive to many women. In other words, it’s not a minor thing that can be brushed off. Yet at Fortune’s Most Powerful Women Summit in the middle of October, Ms. Trump said of her father, “I’m sure he didn’t remember” his conversation with Billy Bush. As Gabriel Sherman at New York Magazine reported recently, Ms. Trump took her father’s side after the tape became public and insisted that he had to fight back. (She also said he had to apologize.)

“I think what Ivanka is doing is extremely cynical,” said Kim France, the founding editor of Lucky, a shopping magazine for young women. “It’s not female empowerment, it’s business.”

And the Trump campaign has apparently been good for her company. Sales in the first six months of 2016 were up almost $12 million compared with the year before, according to public filings. Her editorial director, Sarah Warren, recently said that web traffic is “through the roof” and the company’s newsletter database is 275 percent bigger than it was last year. “You couldn’t pay for this visibility,” Ms. Warren recently told a reporter.

So far, retailers have not responded to the #GrabYourWallet boycott by dropping the Ivanka Trump brand. But in a national online survey of registered voters by Morning Consult conducted after the release of the “Access Hollywood” tape, 75 percent of Democratic women said they would not purchase clothes from Ivanka Trump’s clothing line, compared with close to 60 percent of independent women and a third of Republican women. A smaller survey conducted by Brand Keys of millennial women found that 51 percent of respondents were still “extremely” or “very” willing to buy Ivanka Trump.