Dan L wrote:

I found the cause today. Surprisingly the fence failed at a week point
where the fence ends meet with connector wires. After repair and made
the fence stronger, put her back into the pasture. First thing she did
is run straight to the week point and leaned into it, this time she
failed. I have greatly under estimated the intelligence of cows. She
must have been testing the fence looking for an escape.

Time for some beef. Domesticated animals are supposed to be selectively
bred for docility.