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This is tough. First rule out any medical causes; have a complete work up and check out by your vet. Sudden behavioral changes can be the result of underlying medical problems. Especially have her thyroid checked. Also check the protein level in her food as too high of protein content can acerbate some problems.
Second, I recommend finding a behaviorist to help you analyze her behavior and triggers and hopefully find workable solutions. When herding, biting is as a last resort to control stock, not as a matter of course.
Have you talked with her breeder? Her breeder may be able to offer some insights as well.
Re-homing her still would leave you in a position of liability. Rescue would not be able to take her due to her history now and IF she would bite in the new home, then there is another kettle of fish.
As I said, tough shoes to be in, but hopefully you'll be able to find a cause that can be fixable or at least managed.
Debbie
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