Leaving aside the assumption that all African women are the same (at least in these two regards), this is attacking a very convenient strawman. Nobody says that hard work guarantees wealth. Certainly not in countries where you have to pay off officials to do anything.
What conservatives say is that in a relatively free market being enterprising and working hard typically means you’d be able to gain wealth. Most of Africa doesn’t have a very free market.
h/t Layla Sumner