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You may be looking for the Sonia Acorn from Light Mobius, or Sonia the Hedgehog from the Sonic Underground Zone.
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Sonia Acorn

Sonia Acorn was the daughter of Queen Sally and King Sonic in a alternate future version of Mobius. She was seen to be happily playing with her grandfather Maximillian Acorn along with her brother Manik. She and her family had a brief encounter with Robotnik Prime when he was inadvertently transported to that universe by E.V.E., saying he looked "mean and nasty". Sonia was tragically killed along with the rest of her family when Robo-Robotnik nuked the planet. (StH: #22, #75, IYF)

Background Information

  • Sonia's name was not stated during her appearance in StH #22. She received her name in Sonic Archives #6, it being the same as her Light Mobius incarnation.
  • Both her and her brother Manik are the youngest characters known to have died in the series.