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I'm fairly sure that all non-villagers NPC's are like that. Unless they have a scripted sequence that causes them to disappear, they'll stick around until you "refresh" the screen by going into a building, going to town square, or the clock strikes 6 AM (at which point Isabelle will force a reset to signal a new day).

Presumably, this is to avoid hassles relating to glitches and to make their disappearance from town more seamless. As a bonus, it gives the player a chance to catch up to her if they're running late.
 
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