Depending on how badly you want to keep her you can try this.....
PLEASE DO NOT FLAME ME, this poster is asking for help and this is the only thing I know to do to help. Thanks in advance.
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You can try limiting her movement by using strip ties to shorten her steps. This is slightly humiliating to the hen and may help to lower her status in the flock. She will still be able to drink and eat. You may need to lower her nest if the nests are elevated in your hen house.
She is crowing because she sees herself as the flock leader. She is crowing to challenge any chicken/hen/rooster that she thinks needs to know how important she thinks she is. Just like any rooster does naturally.