It looks like drugs certainly did play a big part. I’ve pinched this from Wikipedia:
Ono and Cox divorced on February 2, 1969, and she married John Lennon later that same year. In the midst of a 1971
custody battle, Cox disappeared with their eight-year-old daughter. He won custody after successfully claiming that Ono was an unfit mother due to her drug use.
[13] Ono's ex-husband changed Kyoko's name to "Ruth Holman" and subsequently raised the girl in an organization known as the
Church of the Living Word (or "the Walk").
[14] Ono and Lennon searched for Kyoko for years, but to no avail. She finally saw Kyoko again many years later in 1998.
Daughter has kept out of the public eye..
I love The Beatles but have never been a fan of Lennon. I am not a fan of “Avant Garde” I must admit, the whole idea of Yoko Ono being a highly acclaimed artist is lost on me. Her idea of art - knocking nails in to walls, and cutting up clothes is a bit of a con I think..
She is getting on a bit now - I think she is around 86? She was reported to have had a refrigerated room full fur coats back in the 70s, and was buying and selling cows for huge profits! At the same time, she was supposed to be a bohemian, artistic hippy..