No, she did not. A thrilling battle involving Riza and Roy against Envy took place on Promised Day. Roy took down Envy, nearly killing him. But, just as he was about to give the final blow, Riza stopped him, saying that she would not allow him to go down the path of revenge and madness. She also said that she would shoot him for killing the already defeated Envy. However, Envy committed suicide in the end.