Replacable Women
I never liked the idea of the Peggy-Cap-Sharon thing. Your woman now too old for ya? She has a sister! They are all the same!
Was Sharon always a member of SHIELD? Or was that just added in with feminism? Either way, if Sharon is a member of SHIELD, they can meet through that, and she's not related to Peggy. Otherwise, isn't it a bit strange for Peggy that her former love is married to a younger family member? Separate the Margaret and Sharon characters. Make Margaret a minor passing by character who is the niece of Peggy who also has a crush on cap, and have her narrate Peggy watching the news reels. Make Sharon's connection to Cap as a SHIELD one.