I have diggers, tunnellers, cave builders! The bottom of my fence is buried in most places, but all the way around, there is a foot of wire along the ground. I buy 8 foot fencing and just bend the bottom foot when I put it up. I use tent stakes, topped with rocks, logs ect to hold the bottom down.

Can you angle a section in at the top to keep her from going over as she grows? I have that too in a few places. Just a couple feet of wire angled in. Stops the jumpers(most of them anyway!). I use game fencing as chain link is a ladder to my huskies!

The other option is one that probably won't work for you. You rent your home right? Your landlord might not appreciate this, but I have gone with abandon all hope of stopping the digging! As long as they aren't digging to get out, I let my dogs dig to their little heart's content! Don't bother landscaping or planting anything. I'll fill in the holes when I sell the place! Our last house, which was home to three huskies, needed six trucks of black dirt to fill in the back yard when we sold it!