The word "perchance" is verging on obsolete. In everyday conversation it would be used only for light-hearted effect or as a deliberate archaism. Perhaps that is what you intended by "playfully".
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Cliveit's not usually polite to refer to someone in your conversational group in 3rd person, eg as 'her'.I think if done "playfully" it would be OK.
NewguestTwo people (X and Y) are talking about the third person (Z). The third person (Z) comes up to themHere is a very typical American response which fits your scenario much better, in my opinion. X or Y says, "Speak of the devil!"