Can't say I really know of any others. When it comes to rap, my knowledge is incredibly limited. I haven't found many yet who are any good, much less many females.

I don't know anything from this artist aside from this one song, but it's a really good one. Ode to Billy Joe - Bobbie Gentry
Unfortunately it's been all but forgotten recently. It's a bit difficult to find. But it's a great song. Nice folksy sound, good story telling, talented vocals...