Try Pur Minerals. The company is based from Atlanta Georgia so they sell a lot of make-up for darker women. They have really focused on making colors for women of color. They also have a great medium dark shade that is excellent for women with a lot of yellow in their skin. It's infused with shea butter and vitamin E and has the coverage of Mac, but is really matte and beautiful. It's sold at Ulta Beauty stores, ShopNBC, HSN and at a counter in Dillards department stores.
Basically, try mineral foundations with a lower level of Mica. The mica is that shimmer in some of the mineral make-up's and it makes darker women look awful! It casts a gray purple sheen on their skin in the light. (check some bare minerals ladies b/c a lot of them have that problem) Check it out though, they have perfected some darker colors because they sell a lot to women of color where they are located.