Had the same thing 2 years ago. If the calf moved, she would try to kill it. We penned them separate. I would put the calf with her only when I was in the pen with my persuader. :wink: Then we would proceed with our training. When the calf would get to nursing and stand right beside her it was fine, the minute they separated a bit, she would attack again. It took about 4-5 days of this procedure with my persuader and then she was good. We couldn't leave the calf with her if we weren't there.
We only made one mistake, and that was that we kept her! :???: We thought that maybe it was because she was a heifer. Same damn thing next year.

I think she is residing somewhere around the Golden Arches now.
If I can lend any advice to this thread, cull prices are good, once she is done raising this calf, SELL HER!!! It isn't worth the risk or time to be dealing with cows like this.