My name is ***** ***** I will be assisting you today. Would it be possible for you to attach a jpeg of the lithograph? It would help in my research.
Received, thanks for sending! I am on it and will circle back shortly.
I was not able to find a definitive answer for you, but I do have a promising lead. There is a seller on Ebay selling a piece by J. Rudy, with a similar style and I would recommend contacting directly. I am posting link below. This seller is an antiques seller, and he or she might be able to shed some light on the artist and if they think it is the same artist.
There is also a brief description of said artist, where the piece was acquired, and a starting price for the art, which is done on canvas, not lithograph.
http://www.ebay.com/itm/LP16-g-Cool-Outsider-Art-J-Rudy-Canvas-Painting-Wavy-Girl-24-x-24-/152275182419?hash=item23744ee353:g:t7oAAOSwsN9XAVNn (copy and past in your browser)
I hope this points you in the right direction, and I would love to hear back from you how it went.