A former Black Widow from Israel who now advises the President on security, and who is the first to work out that the man shooting at him did not choose to.
Ruth Bat-Seraph is an Israeli former Black Widow assassin, trained in the Red Room, and Shira Haas plays her in Captain America: Brave New World. After the fall of the Red Room she became a high-ranking United States government official, the security advisor to President Thaddeus Ross. The reader who sent this list described her as the ex-Black Widow agent who later became the chief of security for President Ross, which is close enough to be the same job.
She attends an international summit and fights Isaiah Bradley and the others who attempt to assassinate Ross during it. After working out that Bradley was brainwashed, she assists Sam Wilson and Joaquin Torres in stopping the person behind it.
Minor spoiler
Samuel Sterns, trying to destroy Ross’s legacy for having enslaved him and used him for labour on a false promise of freedom. After watching Ross turn into a Red Hulk, she befriends an exonerated Bradley, who buys them tickets to a basketball game.