Stella continues to try to dig a nest for herself by our shoes. I'm not as diligent as perhaps I should be in keeping her away from the carpet. I don't want to encourage breeding behavior in her as I really don't want to deal with any potential egg-binding problems. However, she is quite determined, and my alternatives are 1) giving up any hope of getting anything else done so that I can constantly remove her from the area; or 2) keeping her locked in her cage. Neither is a very attractive alternative. Notice all the carpet pieces on the floor to her left.
She does not show any adverse behavior when digging. Thomas or I can go to her mid-dig and ask her to step up. She immediately hops on to our hand, with no aggression issues. Also, I don't have any reason to think that she will lay an egg due to this behavior (if I did, you can be sure that I'd be keeping her away from the carpet!) She hasn't shown any signs of doing so in the year and a half we've had her -- I'm just trying to be careful!
Interestingly enough, she only appears to want to dig when Thomas or I are in the room. Several times during the past week, I've left the room while she was digging, only to return a few minutes later to find her perched on the playstand or wandering around looking for us.