I don't think the first Death Star was a new in episode IV. I think it had been "keeping the peace in other systems," so it's possibly that straight arrow Leia wouldn't have been aware of it or rumours of it and probable that old Ben Kenobi wouldn't be.
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I always took Leia's comment to mean her adoptive mother -- there's a possibility that Bail's wife died young.
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As for Leia, curse you, George Lucas!</i.