She didn't get any money from her first divorce, she ran Bruce's business (and probably made him rich) and, without her, all of those children would just be waiting on their inheritances from Caitlyn.

I think each of the successful kids has had some entrepreneurial spark but I highly doubt any of them are making important decisions without Kris's input and I'd bet Kris is making most of the decisions for Kylie.

Kris is self-made (category 7 on that Forbes list you posted). Kylie isn't.