After fellow Welk Performer, Joe Feeney, brought the album to Mr. Welk to listen to, she began to make several guest appearances on his ABC-televised show.  In August of 1959, she was signed as a "regular" on the popular Welk television show, replacing the show’s Big Tiny Little.  Castle remained with the show for 10 years.

In 1960, she met and married her first husband, Dean Hall.  Hall was a cameraman for the Welk Show and they had a daughter together. They divorced in 1966.

After opening a bar and nightclub called Jo Ann's Castle in 1968, she met and married her second husband, Bill Roeschlein, with whom she had two more children. 

She met and married her third husband in 1978. They divorced in 1986.

In 1994, she was given a second chance to perform for the Lawrence Welk Show at the Welk Resort Theatre in Branson, Missouri, where she was a regular performer for several years.

Now in her 70's, Castle resides in Branson, Missouri.