The scene takes place right after the epic chase between Bucky, Cap, and Black Panther that featured the latter revealing himself to the world.
The introduction of the Sokovia Accords brought Black Widow and Black Panther together for the first time, and became the beginning of a constantly shifting relationship throughout the movie.
When fans think back to Captain America: Civil War, the one instance that instantly comes up is the airport scene.
Marvel could continue to push their friendship soon by placing her in Black Panther, but that is just pure speculation at this point.