The distance in question, and the reason she kicked the gun away, was so small that he could have easily attacked her, grabbed her arm, or stabbed her with a concealed knife, is the distance between him and his fallen gun.
She shot him at closer range the first time, she could have easily shot him again with the right tactics. He could have done everything you imagine while she had her back to him,off balance, trying to pick up the gun. (watch the video)