Some interesting information can be teased out of the publication information, especially the dedications, of Quinn's books. Below is a chronological list of her books with publication year, name as presented in the book, publisher, and anything else of note.
Many of the dedications are to family and I've identified them where I can make those connections.
Named as: Text and Music by Elisabeth V. Quinn
Publisher: Frederick A. Stokes Company
Named as: Elisabeth Vernon Quinn, Ed.
Note the s in Elisabeth.
Publisher: Frederick A. Stokes Company
Reprinted by the National Review in 2012
Named as: Elizabeth Vernon Quinn, Ed.
Publisher: Samuel Lowe Company
Named as: Elisabeth Vernon Quinn (translator)
Note the s in Elisabeth
Illustrator: George W. Hood
Publisher: Frederick A. Stokes Company
Dedication: To Natalia, Elena, and Gonzalo for whom the stories were written and to Ruth, Elisabeth, and Davis for whom they were translated
Note: Ruth and Davis are likely her niece and nephew, and Elisabeth her grandniece (through Davis).
Named as: Vernon Quinn
Publisher: Frederick A. Stokes Company
Reprinted by Grosset & Dunlap in 1938
Dedication: To D'alary Fechét, Major, US Army
Fechét was stationed in Germany with the AFG while Quinn was there. He never married and had no children when he died in San Diego on 24 September 1965. This book comes out a couple years after she returns to New York.
Named as: Vernon Quinn
Publisher: Frederick A. Stokes Company
Reprinted by Grosset & Dunlap in 1940
Dedication: To Carson Quinn (Quinn's youngest brother
Named as: Vernon Quinn
Publishers: Frederick A. Stokes Company and F.D. Goodchild Company (Canada)
Reprinted by Grosset & Dunlap in 1938
Named as: Capini Vequin (co-author with Jerome S. Meyer)
Publisher: Blue Ribbon Books
Named as: Capini Vequin
Publishers: Frederick A. Stokes Company and T. Werner Laurie (London)
Named as: Vernon Quinn
Illustrator: H.C. Murphy
Publisher: Frederick A. Stokes Company
Dedication: "To DAVIS QUINN whose love of color and adventure, of Indian lore and the out-of-doors, of tales of heroic deeds in the long-gone past, is an inheritance from that hardy pioneer ancestor who took up the torch where Captain John Smith dropped it and, with its flame burning brightly, pushed civilization westward--the first white man to cross the Blue Ridge Mountains."
Notes: Davis Quin is her nephew. John Lederer is the first European to cross the Blue Ridge Mountains.
Named as: Vernon Quinn
Illustrator: H.C. Murphy
Publisher: Frederick A. Stokes Company
Named as: Vernon Quinn
Publisher: Frederick A. Stokes Company
Named as: Vernon Quinn
Illustrator: Paul Spencer Johst
Publisher: Frederick A. Stokes Company
Dedication: "Nancy Miller who hates geography and to Bill Kendall Miller who doesn't like it at all!"
Named as: Vernon Quinn
Publisher: Frederick A. Stokes Company
Named as: Vernon Quinn
Illustrator: Paul Spencer Johst
Publisher: Frederick A. Stokes Company
Named as: Capini Vequin
Publisher: Editorial Cenit (Madrid)
Note: Spanish (Spain) version of Hands Up!
Named as: Vernon Quinn
Illustrator: Marie A. Lawson
Publisher: Frederick A Stokes
Second edition published in 1937
Dedication: For Viola Swanson Quinn Whose Attractive Garden and Quinwood Helped in the Making of this Book
Named as: Vernon Quinn
Illustrator: Marie A. Lawson
Publisher: Frederick A. Stokes Company
Dedication: To Blanca Moody, A Great Artist, A Charming Companion, A Loyal Friend
Named as: Vernon Quinn
Illustrator: Marie A. Lawson
Publisher: Frederick A. Stokes Company
Named as: Vernon Quinn
Publisher: Frederick A. Stokes Company
Dedication: For Carmen Houston
Named as: Vernon Quinn
Publisher: Frederick A. Stokes Company
Dedication: For EXQ
Named as: Vernon Quinn
Illustrator: Paul Spencer Johst
Publisher: J.B. Lippincott Company
Dedication: For / Thomas de Pinillos Moody / who asked for this book / and / Carmen Joan Moody / who perhaps may like it / and / Robert King Moody III / who doesn't want it at all
Named as: Vernon Quinn
Illustrator: Da Osimo
Publisher: Frederick A. Stokes Company
Named as: Venon Quinn
Illustrator: Frank Beaudouin
Publisher: J.B. Lippincott Company
Named as: Vernon Quinn
Illustrator: Frank Beaudouin
Publisher: J.B. Lippincott Company
Named as: Capini Vequin (co-author with Jerome S. Meyer)
Publisher: Crown Publishers (New York)
Named as: ?
Whitman Publishing Company (Racine, WI)
Named as: Vernon Quinn
Publisher: J.B. Lippincott Company
Named as: Vernon Quinn
Illustrator: Charles E. Pont
Publisher: Lippincott
Named as: Vernon Quinn
US Playing Card Co. (Cincinnati, OH)
Dedication: To / Joan and Ann / and / Richard and Evan / of the House of Horace Miller
Named as: Vernon Quinn
Western Publishing Company