So I get up this morning and I put the dogs out in the dog run. They romp off happily into the snow and I got into my office and start messing with my computer. A few minutes later, I hear something go "thump!" up against my kitchen patio door. Having my suspicions, I walk into the kitchen, and sure enough, Belle is out of the run again and she's now laying on the back patio up against the door, just waiting for me to open the door and let her in. No idea how she keeps getting out (or why Murphy doesn't follow her) but at least she's easy to recover. She's apparently decided that this is her home and I'm her person and she has no desire to roam, unlike every male Shepherd that I have or have had.
I'm going to have to put her out there one of these days when I've got a bit of time and then just watch her to see how she's doing it. Then I'll have to close off her escape route. Please don't tell me that she's just vaulting it; the fix for that will be new, higher fencing and that won't be cheap or pleasant, nor can it be done until the snow's gone.
And God help me if Murphy ever starts emulating her. Then I'll have real trouble.