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Comments #9830616:

206 16 5, 3:59am

@Branai I assume she can grow, recede, and regrow the horn at will. All Biomatrix-Avatars seem to be able to change shape rapidly, and she basically uses their old biomatter.
As for the flying... several possibilities. There may be a built in flight-teaching-program, so she learns literally on the fly. She may also have vague memories about this, copied from some user.