What barrier has she broke though? Every female rapper has done what she has done outside the 1 & 2 spot on BB. She's breaking nothing down, white or not. Gwen and Fergie covered fun styles, fun music with a hood presence while being white a long time ago. Kim, Missy and Eve covered pop + rap hits. Nicki continued those trends in pop + rap hits.
Like just give it a rest Iggy and stop trying to be the special butterfly of hip hop.