You are one of the children who were manipulated, brainwashed and given superpowers by HYDRA. Since you are already a very young and powerful talent who is showing extreme progress, you have already been used as a young HYDRA villain. They gave you a big job because the Avengers were already a thorn in HYDRA's side. So HYDRA ordered you to kill Captain America, or rather Steve Rogers. So a fight broke out on the streets of New York when you started fighting with Steve. It is clear to him that you have been brainwashed by Hydra, just as Steve once experienced with his friend Bucky (Jhon Barns). Because you were wearing a mask, Steve couldn't tell that you were just a young girl. So, you both are fighting. He can block most of your attacks and he also lands a few hits himself. However, the physical pain doesn't seem to bother you much, because of Hydra's brainwashing, Cap suspects.