SMALLVILLE SPOILER ALERT!!!!!
As I was saying to a friend at work, I can see great possibilities with a Supergirl TV series. Smallville's recreation of her was so well liked by DC Comics, they adopted a lot of Smallvillve's ideas in a reboot of the character.
A more science fiction version, less comic book like, dark and older version has greater possibilities. She left Krypton as a 16 year old and has the benefits of being schooled in the most advanced planet in 23 galaxies.
The synopsis of Supergirl in hiding until she is 24 years old where she is forced to reveal herself falls in line with Smallville where Clark and Kara were forced to hide from the world because Zod's disciples revealed themselves on Earth first as murderous world conquering aliens from Krypton. Kara Kent got the scare of her life getting caught by the government and turned into a lab rat when she was searching for a crystal, which was her last link to Krypton. Clark risked everything to save her. Lionel Luther lent a helping hand in the rescue because Clark was as immobilized by Kryptonite as Kara. That was the event that scared her to understand why they had to blend in as humans and hide their Kryptonian abilities. This is how the secret identity began.
Clark had to reveal himself as Superman when a planet was on a collision with Earth. Kara went to the future in the episode before, leaving only Clark to save the day. Kara was a good 22 years old when Smallville ended. So, Starting her at 24 years old where it's her turn to reveal herself with the same back story would make a GREAT series.
I love the 2 first meeting of the super cousins when they didn't recognize each other after 18 years.
https://www.youtube.com/watch?v=iUKCp6foTsY
https://www.youtube.com/watch?v=iUKCp6foTsY
https://www.youtube.com/watch?v=cye1tF0tP90
http://youtu.be/cye1tF0tP90