[user104658]

I believe that she established her cosmetics line with her own capital, but it's capital she made off of her family name and by virtue of "Being A Kardashian" in the first place, and also, the company took off with ease because she was already an established "social media influencer" and thus had a huge marketplace ready to buy her product before she even started, and with little to zero advertising.

Its a self made business in a sense, as it was built without the backing of a company or investor, but as an individual neither she nor her image were "self made" BEFORE she started the business, so it's not really possible to describe the overall fortune as self-made. She might have built the rocket ship but her family gifted her the launchpad.