The map thing threw me a little the first time around, but by the end it became obvious (I thought) that it was introduced so the reader would be ready for the "magic" at the end of the story. As a concept, the map thing seemed both unlikely for a "witch" and a bit common-place for science (if you read enough sci-fi some variation of folded space crops pretty regularly), so I'm not surprised she didn't expand on it.
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