Originally Posted by cherokeesam
Sharon Carter would probably be exclusive to Cap's solo franchise, but not part of the Avenger franchise.
I'd be okay with MEW as Carter, too, but I'm inclined to agree with the poster above who suggested you might be her agent.
But that doesn't mean she wouldn't be apart of a S.H.E.I.L.D. film or have a cameo role in a Black Widow & Hawkeye film.