Bad dog! ... oh wait ... She didn't do anything wrong, so why is she acting like she did? →[More:]

Very, very occasionally... like right now, Sky goes to her bed and lies there looking very dejected, humble, downcast. (Normally, she sticks to me like glue.) Usually, I can sort of figure out why:

* She gets a little upset if there is big-time housekeeping going on; she doesn't like things being topsyturvy and different than usual.

* A visiting dog becomes tiresome and she vahnnts to be alohne.

* She made a peepee in the house.

* She's been scolded

But sometimes (fairly rarely) none of these things has occurred, and I can't detect anything else out of the ordinary, yet she does this.

Any insights?

Some notes: She's apparently had trauma related to bathroom issues before, so she never gets punished for anything like that, she only gets praised for doing good, and potty mistakes now are just about zero. When she first came to live with us and I would let her outside in the courtyard to do her business, she would dash inside immediately afterward and cower on her bed for a bit. (Almost all potty happens on walks, but when it's raining hard, or I'm sick, or stuck waiting for a call or something, she goes in the courtyard, and she's not freaky about anything peepeepoopoo anymore.)

My first thought today was that she had gone in the house, because we had a young dog visiting Sunday who piddled inside, and since she's very determined about marking over other doggy urine in the neighborhood (yeah, she's a girl, but she marks and sometimes even lifts leg), I figured it was too much for her and she had to counter this egregious action with a little business of her own. But I searched everywhere, and didn't find any evidence of same.

Nothing different here... not even me being in any kind of bad mood unrelated to her, or sad or anything. Weather fine, all is well. If she wants something - food, attention, walk, play - she's not shy about asking. If she's bored, she dashes around the house and disembowels shoes, so it's not that. The only other thing I can think of is illness, but she seems perfectly fine, and hasn't eaten anything unusual. Oh, and in the time it took me to type all that, she's now back at my feet under the table. Little weirdo.