What you don't know is whether or not the defender makes contact at the same time that she toe touches the ball. Having watched this clip which show 2 different angles. My first thought is foul and pk. Would the call been different if the attacker had gotten really hurt, or does it even make a difference. While I agree that defender came from the side. The way the attacker falls somewhat indicates that she got caught from the back. Tough break..
Was a PK given?