She apparently doesn't need them. Thankfully, when they have someone hopelessly outnumbered and surrounded, they send in one man at a time while the rest stand around picking their butts. That whole scene bothered me, not just because the harpies were so laughably incompetent, but because it paled in comparison to how horrible Stannis and Melisandre proved themselves just prior.
And by the way, honest question: Does Dany have greyscale now? Jorah held her hand for a good while.