What was Billie Burke's accent in Dinner et Eight?

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Example of her accent:

Billie Burke's speech - Dinner at Eight (1933)

Related Thread:

Did Billie Burke Really Talk Like That?

Most of us know her as Glinda the Good Witch in the movie “Wizard of Oz,” and have noticed her unusual voice. I was wondering did she talk like that in real life? I realize that in those golden years of movies that actors/actresses often used a exaggerated accent here and there or for effect but I noticed reviews at the time always comment on her unusual voice. Here is a sample of the OTR show “The Billie Burke Show” (the click leads you to a page where it says “listen to a sample episode” an…