That's her origin, she's an immortal much like Marvel's Thor, you are not going to find a teen-aged Thor in a modern High School. I find nothing wrong with her World War II origins, a downed fighter pilot crashes on a mysterious uncharted island full of Amazons, that is the standard origin for Wonder Woman. That's politics, Wonder Woman is a crime fighter, not a negotiator. I just think Wonder Woman is not a suitable character for a high school small town setting, there is a character very much what they are trying to make her out to be and that's Supergirl. They had a supergirl in smallville, so why not a series about her? They start with Wonder Woman and try to reinvent her so that she is no longer reconnizable to her established audience base. Why fit a square peg in a round hole when there it a round peg ready made that already fits?