SW may have purchased Thrive products in the beginning. But after she referred 2 people who began to use the products, she received hers for free. As additional people joined, she continued to earn free product. Once she became a promoter and built her team, she would have been eligible to receive many of the new products at no cost. She then was able to use the product, or give away samples to increase sales.
Although; she could have written many of her expenses (product purchase- if any, home office, cell phone, Apple watch, internet, clothing, etc.) off on business taxes. I (personally) don't believe her business was contributing to any financial hardship at the time of her death.