Is That Anne Baxter's Own Voice Doing the Irish Accent?

I just watched Luck of the Irish for the first time, which I greatly enjoyed. (By the way, the 10-movie set of Power movies put out by Fox on 5 DVDs contains this movie, and many other rare films as well, some of which are very good.)

I have a question about Anne Baxter's accent.

As I looked at her speaking, I could not see the usual signs of dubbing -- the obvious or subtle mismatches between mouth movement and sound. I had the impression she was saying the words herself. But sometimes dubbing is very skilfully done, so I can't be sure.

I wasn't aware that she had any Irish in her background, so if she did it all herself, she must have had a natural ear for accents -- or at least for an Irish one. Does anyone know anything about this?