Aha. The Young Avengers are a group of kids who became 'Young Avengers' after the real Avengers disbanded. Only a few of them represent original Avengers, like Wiccan - Thor, Hulking - Hulk, Patriot - Captain America, and Iron Lad - Iron man. This is the new run of the comic with newer people. But yes, the girl is named Hawkeye. She's kind of like Hawkeye's pupil.
In the picture the only ones from the original run are the two flying in the background and the female Hawkeye.
Cosplays of the future:
Sansa Stark 
Agent 13