Still, she shouldn't be more than a cameo. Her and Hawkeye's inclusion in the main roster tells me two things, one good, one bad.
Good: It'll give Cap, Stark and Thor more to do, especially with the news that a certain item of great power will be in Thor and you know that they're not going to go smaller than that for the big team movie, so there's going to be a big need for heavy lifting (something two members with actual superpowers could help with).
Bad: It's looking to be very Ultimates influenced.