There is an interesting device you can use to get an estimate on a model's money girl status. You take a list of the highest paying clients in fashion, weigh the going rates these clients pay for their contracts and then apply it against the body of models employed by those clients.
Who are the power clients? They are brands like Victoria's Secret, cosmetics giants like Estee Lauder & Lancome, as well as the many fragrance contracts and endorsement deals. Or the rare case of a clothing company (like Calvin Klein) willing to pay a model a high-six figure sum.