Sometime before the games, SatAM, and the comics, I don't believe its ever been stated.
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Sally isn't in Sonic X
In the comic "Sonic Universe" Sonic the Hedgehog and Sally Acorn get married. They have kids, Manik and Sonia.
Sally is not a video game character so no she does not appear in any Sonic games.
No. Sally and Sonic are a couple.
well what I think is that after the events of sonic the hedgehog, Sonic just broke contact with Sally and never saw her again.