Only played the role of Dolly Levi once while understudying Ginger Rogers, who refused to miss performances, but Osterwald played the role 121 other times while understudying the other actresses who played the title role.
Attended Catholic University U.S.A. in Washington, D.C.
She was a lifelong conservative Republican.
On December 22, 2020, she was honored with a Sketch of the Day caricature on the website, Star Portraits.
On May 29, 2021, she was recognized with a Sketch of the Day caricature on the website, Star Portraits.
Upon her death, she was cremated and her ashes returned to her son.