I bet later in the series, she wants to be a normal human being if she is not immune to retro-mutagenic or Donnatello manage to create another type of retro-mutagenic but then it will end up that she unfortunate come in contact with mutagen and mutates an anthropomorphic turtle. She had become accustomed, will choose to be a mutant turtle and become one of the ninja turtles, her headband would have been yellow since she goes with yellow clothes in most incarnations and it will be the possibility of Donatello to win her heart if he likes her whether she is a human or turtle.