Well, digging is a good sign that she's feeling healthy! Digging is also a female thing. What I've done is to buy a scrap piece of HEAVY plywood (sev layers thick), staple old carpet scrap to it and place it over the place she is digging..... It should be too heavy for her to move while she is digging. The nice thing about this is that when company comes over you can whip that board under the sofa to hide it if nec. and then bring it back out when your company is gone..... The other thing you might do is to put a covered cat litter tray there and fill it full of shredded paper........let her dig in that..... She may mistake it for a real litter box so you'll have to keep and eye (and nose! ) on it but it's better than losing the carpet.......