At this dog's age, she needs some testing done, since this could be almost anything. Talk to your vet and see if he can prioritize the tests--do the ones that are likely to give the most information first. Also ask if they have "care credit"--it is a medical credit card for animals that you can apply for right at the vet's office.
Is she spayed? The combination of not eating & suddenly digging holes makes me wonder about nesting behavior--possible false pregnancy, ovarian cyst, or uterine infection?
She may also have a fever & is digging the holes to cool off
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