How did Maria become a HEDGEHOG?

Maria did not turn into a hedgehog.

She may have been reborn as a hedgehog, but perhaps Silver or Blaze took her dead body and attempted to revive her, but a big malfunction did revive her yet turned her into a hedgehog.

SHE DID NOT! It's just a fanmade concept to make Shadow happy.

Maria did not turn into a hedgehog.She was a human like Elise,You're right.Maria died and did not come back in the games.

Yes

Because maria died. so the three hedgehogs, silver, shadow and sonic used the master emerald's power to make maria alive. but what happened is maria was alive as a hedgehog. I think knuckles forgot to say that what type of creature/people that used the master emerald to revive someone that would be his/her type of creature. Sonic x heroes forever ep. 2 birth of friendship