Captain America and Lady Liberty: The First Avengers

What if Anna manage to save her sister, Elsa, but she is still in her frozen form. What if she wakes up in the Hudson River of New York City in 1942 where World War 2 is taking place. What if she meets Steve Rogers and decides to go with him to become a Super-Solider. What if they both became Super-Soldiers? In this universe women can join the army. Rating may change from T to M.