She means jobs for the white working-class, not economics. Every economist values free-trade. Consumers will get higher quality products at lower prices if we pass more free-trade deals.
Sure, we can create price floors and impose high tariffs on imported goods to increase jobs for the white working-class. We'll just have to raise taxes for the people who actually earn their jobs. This is a ludicrous argument. We would never say something similar to create jobs for under-represented minorities.
We need alternatives to Silicon Valley in the rural areas of Wisconsin, Michigan, Ohio, and Florida. Stanford graduates have to think about moving to Iowa. If we can create great companies elsewhere, the white working-class would start to see different opportunities. Once their financial situation isn't at risk, they'll start to engage in politics in a more meaningful way - in a way where we'll actually talk about who is fit to be President and not the person who's just saying all the right buzzwords.