Welcome:

Terriers/puppy's naturaly like to dig, so
your problem is two-fold.

All my dogs as pup's did some form of digging. My young male still digs when
bored but not nearly as often. My suggestion is to keep your
dog busy when you are home with play and walks before and after work.
When you are not home and not able to
catch her in the act, maybe you can
confine her to a smaller area where she
can not cause any damage. That way when you let her out after work, you can catch her in the act and teach her not to dig.
With training and maturity she will get less destructive. You might even consider
taking her to an obedience class.
Remember she is still a mischief puppy.
Good luck, Shelby sounds like
a cutie. : )