Adalind only looked like Juliette for what, based on her, Juliette's and Nick's transformation separately, an hour tops? Conception takes a minimum of several hours (as mentioned already) to days before an egg is fertalised. She left Nick's place immediately after the deed was done and changed back in the cab. Kelly's biologically Nick's sperm and Adalind's egg mushed together. Adalind had long turned back to herself when Kelly was conceived, magic or no magic.
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