Selene wtf stomps cap. Mismatch. She would take bor catch the shield from him about as easy as he would be able to do to any human of average strength levels.
Wait...no weapons? That changes things. Bigger stomp. Selene decaps or punches a whole through his chest before he can react.
By the end of the movies Selene is solidly above Cap in all areas. She is a lot closer to IM level ( minus hard durability but regen) than Cap imo.