If your 17 month old daughter was following one of his hens as you said, he obviously saw it as a threat to his hen. I don't fault the rooster one bit for what he did. It is what he is supposed to do, protect his flock.
That said, your daughter is much more important than the rooster. It would not surprise me a bit since he has identified her as a threat that he will go after her next chance he gets. A very important tactic of roosters is ambush. If he can at all, he will sneak up on her. I personally would not risk it.
By the way, this is not an unusual story on here. I've seen several where young children were messing with a flock and the rooster went after the child. It is unfortunate, but young children and roosters can be a dangerous combination.
That said, your daughter is much more important than the rooster. It would not surprise me a bit since he has identified her as a threat that he will go after her next chance he gets. A very important tactic of roosters is ambush. If he can at all, he will sneak up on her. I personally would not risk it.
By the way, this is not an unusual story on here. I've seen several where young children were messing with a flock and the rooster went after the child. It is unfortunate, but young children and roosters can be a dangerous combination.