Hetty Green...Is she the one in the early 20th century that was so miserly she allowed her nephew's leg to be but off because she wouldn't pay for an operation on his leg or something?
Probably. But the only point that counts here - since we're talking about money - is that she died with something like the modern equivalent of $2.5B. Richest woman in the world at that time, I think.
Interesting idea of "female entrepreneur", there. Unless you're talking about the second oldest profession and raising questions about her primary motivation in marrying Jeff...