My cockerel has been trying to mate since He was 12 weeks, and one hen wouldn't sum it, so he almost ripped her comb off, its very possible he inflicted pain once or twice, and that was enough for her.
Supervise her very closely out there. Pretodores such as hawks will snatch her up in an instant, and she literly can't see them coming. Amber stays close to me, so I guess that's good. She looks to be near POL!