Cosmo died because Tails had to kill her with a cannon he had no choice =[
however, in the Japaneese, when sonic returns to the tyfoone and gives the seed to Tails, Tails says "It´s not true. Just a second ago this was Cosmo" so if you are going acording to the japaneese version she was turned into that seed
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# Does Cosmo return to sonic x in season 4 or 5
Cosmo is a plant-like creature known as a Seedrian.
8 years old.
Yeah, pretty sure she is
the episode were Sonic x and Cosmo fall in love is on the Internet. look for the walk though. u will get the answer much quicker then asking Answers.com.