Deep yogurt, huh?
Well, we are currently conducting an experiment: we have closed the closet door so she can't get into it. Shortly after she tried to get into it, and discovered it was closed. SHe then spent about half an hour trying to get it open, but it is a giant door that runs along the whole wall so she had no luck. She decided to spend some time under the bed.
That was yesterday. Today the closet door is still closed, and she is sleeping out in the living room beside me while I work.
I think that maybe she was maybe just enjoying some peace and quiet. I don't really know. We think that maybe she was disrupted by her dad's work schedule change. For 15 months he had the same days off and the same shifts, and then all of a sudden his work switched his days off (twice) and his shifts start a little later. SO maybe she was upset. We will open the door in a few days and see if she hibernates there again.