Okay, so the good news is that I found a digital print of the movie that Georgia Holden played the role of the dancer in. The problem is that the only existing version of it has deteriorated and I believe that Holden's scenes were removed from it. For anyone who is still interested in seeing it, I've made a special edited version of it in which I have reinserted the missing footage, so the quality might be shaky. Here is the link:
https://www.youtube.com/watch?v=vpqTEEtBedk
YouTube's automatic copyright claim system has flagged my video for some reason, despite the fact that nobody on paper owns the rights to this film anymore according to the copyright office. Regardless, I hope you enjoy.
[UPDATE: I won the content ID claim battle against the two companies trying to monetize the video. It is official, Right Hand of the Devil is in the public domain.]
Also I have written an article on my site that has a snippet from the film's promotional materials that has some of Georgia Holden's professional backstory, here is the blurb on Georgia Holden:
"GEORGIA HOLDEN, playing the part of the dancer, commenced her career in New York in 1949 in an ‘off Broadway’ show. In the early Fifties, she joined a touring company of “My Pal Joey.” Ending the tour of the United States in Los Angeles, she decided to try her luck in Hollywood. And like most of the talent coming to movietown [she] could not find employment, so commenced in 1955 to take lessons in stage dancing. Soon spotted by a theatrical agent, she found herself playing all the principle clubs in the nation and for 6 months as Las Vegas. Miss Holden makes an impressive debut in “Right Hand of the Devil.”"