I'm not trying to be mean, but...

I'm not trying to be mean, but I think Rose might be the dumbest dog I've ever met.  I consider myself to be a dog person but I've never encountered anyone like her and I need help.

It doesn't matter if it's below freezing or if it's raining; she sleeps out in the open (usually in the middle of the yard).  She has a heated dog house not to mention a doggie door to actually come inside the house.  She knows how to use the doggie door but sometimes stands there slapping at the flap before she'll actually come in.  The other day when it was raining and I wanted her inside we had to coax her in and I sat with her on the couch for over an hour; but when she got tired of that she went outside anyway and not under any sort of shelter.

She doesn't eat much unless we coax her to do so; she was thin before she was lost for 2 weeks, but much thinner when we got her home.  The people who'd found her said that they couldn't get her to eat (or eat much eventually), either.  I don't understand this.  Does she not feel cold or rain or hunger?  Does she just not care?

I've said before that she likes to be up Cubba's butt and if he's outside that is still true.  Only once or twice has she followed him indoors.  Before we had a doggie door she slept in the dog house with him, but now doesn't even go in there (and the blanket inside should smell like him still, but she keeps dragging it out into the middle of the yard to lay on it - weather be damned).

I guess the simple conclusion would be that she's not uncomfortable and doesn't feel hungry too often, but when I see her literally shivering while rolled up in a tiny ball out in the open in the cold it breaks my heart.  I tried to make her stay in last night by "closing" the doggie door, but every time I checked on her she was sat in front of it whining.

I'm not trying to be funny when I say this but I feel like she might have special needs and I just don't know what to do for her.  Please advise me.

Update:  I ate with her and Shaun pretended to. That's the most we've seen her eat in one sitting.