Conversation so far:
who played dorothy in the wizard of oz
Judy Garland played Dorothy in the Wizard of Oz.
how old was judy garland when she played dorothy in the wizard of oz
Judy Garland played the role of Dorothy, at 17, in the 1939 film The Wizard of Oz.

Question: who did garland compete against for the role
Self-contained rewrite: who did judy garland compete with for the role of dorothy in the wizard of oz