I searched for "Louise Fornaca ballet" and found some references and reviews references to her work in "Oklahoma!":
- "Broadway," listed as a replacement for "Dancing Ensemble, One of Jud's Postcards, Sylvie", 1943-1947.
- "Theatre Guild," , Seattle, 1946. (Unfortunately, the link to "Theatre Guild" is broken.)
- "Boston!," "Louise Fornaca Is Leading Comedy Dancer in "Oklahona!" Company", "Boston Globe" 1947.
- An article in the "Tri City Herald," about her husband, a "wandering bricklayer" with her on tour.
- A link to a group photo in the "Berkeley Daily Gazette."
- Another handful of Google archives reviews/references to her in the "Oklahoma!" tour.
- It looks like she's referenced (with regard to "Oklahoma!") in "The Girl Who Fell Down: A Biography of Joan McCracken."
She was also in "The Wizard of Oz." From the "St. Petersburg Times
One of the reasons for the operetta's success is Louise Fornaca, as the Sorceress. She is a capable ballerina, as much at home on her toes as in ordinary dance steps.
There are paid articles where the search results mention her in Agnes deMille ballet(s) ("Christian Science Monitor"), as a replacement in "Porgy and Bess" ("New York Times"), and one that suggests she appeared with Alicia Markova ("New York Times").
From 1934, an article
in the "Border Cities Star" that reads:
Rose Bennett, Edith Grant, Dr. Allan Roy Dafoe, Mrs. William Dafoe and Louise Fornaca, are shown back stage at the Radio City Music Hall, New York City. The quintuplets' doctor was much interested in back stage mechanics. The girls are members of the Radio City Rockettes. Dr. Dafoe is now en route to his beloved north.
This is a link to a .pdf of a 1943 mention in the "The New York Sun" in "The Youngest Profession" column:
the Corpe de BaUet dance the complete, exciting four-part ballet from Gounod's opera "Faust" with Muriel Gray, Nicholas Dak* and Louise Fornaca in solo roles
bing searches bring up other references in the search results summary text, but her name is missing from the text on the linked page.