She married Klaus Donath. She's actually from Texas. She is about the same age as me. She had a bubbly personality and was a bit of a character. She sang for over 50 years, taking good care of her voice.
https://www.csmusic.net/content/articles/helen-donath/
She never became on of the most famous singers in the world, but she was very good. Not all the good singers become world famous. I could say the same of three local sopranos, who are also fantastic. I gave some thought to what recordings to show off what she could do.
First, there is Bach Cantata no. 51 with Marriner and the ASMF--and I thought Schwarzkopf was fast! Wow! Maurice Andre on the trumpet!
https://www.youtube.com/watch?v=JGohWn-NcHs&t=804s
Schubert's Shepherd on the Rock
https://www.youtube.com/watch?v=6hETqAE4wus
And at age 74!
https://www.youtube.com/watch?v=uLqfRtpLfj0