Gygax and the Blumes had TSR nearly bankrupt in about 10 years. Unearthed Arcana and Oriental Adventures and Williams' investment provided the capital needed to save the company, plus her
wrangling with the banks, which didn't have enough faith in Gygax as CEO. Williams' run lasted a little longer than they managed. She saved the company first, got it back on its feet, then made her own mistakes and eventually ran it into the ground too.
If you don't want to buy the history books,
When We Were Wizards is available for free.