Obviously, she's digging out of boredom. One alternative would be to crate her while you are gone at work. Crates are not cruel as long as you don't leave her too long in the crate. How long are you gone at work?

If you are gone too long to confine her during the day, then try buying a bunch of toys. Kong toys with treats in them work well, buster cubes, balls?

If she is digging in the same hole, over and over again. Then fill the hole in and put in some of her poop. Sounds disgusting, but she won't dig there again.

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-Rottie