Was she able to benefit financially from any of her better known work? Some fantastic musicians are very poor business planners.
She’s said she was making more money than anyone else she knew. That’s why they worked so hard, it was good money and they were in high demand. At the time that’s what was important to the musicians, not credit.
“at the peak of her session activity she was making more money than the US President.” https://en.wikipedia.org/wiki/Carol_Kaye
https://en.wikipedia.org/wiki/The_Wrecking_Crew_(2008_film)
Trailer for “The Wrecking Crew” https://youtu.be/hhl-3EOYTkc