I am so sorry your girl is not herself. I experienced this with my little chihuahua. Her little bed was right next to ours, and she would get up and walk in tight circles many times at night. I would hold her, calm her, and get her back to bed. She still ate well, she never gave up on that.
She often got lost in our house. I think the crowning blow was when her favorite friend, one of my dear friends, came over as she often did, and Stella refused to have anything to do with her. Before, she would sit on her lap for hours.
I knew it was time; I tearfully told my veterinarian, a close friend who tells it like it is, that Stella still knew me. Her response? "She is used to you."
Hard to let tiny Stella go. She was seven when I got her, and hadn't had much of a life until she came to us. I feel so sad that her good life had to come to an end.
She was an uninspired little agility dog, but she LOVED it. She was also the softest little cuddle.
My Tess Basenji is sixteen. She is okay, but having lived through Stella, I know that she is slipping. I want to say goodby to her while she still knows me and wants my company.
I will put you and your pup in my prayers.