She's allowed to do it, I'm not disputing that. I just don't think it's a particularly well thought through business strategy.
IMO if you have to stick your name on a product to be successful, then the product isn't distinctive enough to sell itself. And the homewares market is already very full of people trying to trade on their name, along with companies with well-established brand names. It's a very competitive market that's a challenge for new entrants. Relying on a famous name as the selling point also has the potential to go sideways really quickly, if something negative affects the perception of the famous name.