Yup! She took over when Baum passed away. I had a bunch of first edition Oz books when I was a kid. Wish I still had ‘em!
I also had a huge set. I loved those books and the illustrations.
Baum trivia:
I stayed in the “Wizard of OZ Hotel” when I was a kid that was owned by the daughter-in-law of Baum.
They had a photo of Oliver Hardy from the 1925 version of the film on the wall.
There were life-size cutouts of the characters in the yard.
My mom bought a painting done by his daughter-in-law.