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.
who did judy garland compete with for the role of dorothy in the wizard of oz
Several actors were reportedly considered for the part of Dorothy, including Shirley Temple.

Question: who played glinda
Self-contained rewrite: who played glinda in the wizard of oz