Our poor little girl just isn't herself anymore. And I'm not quite sure what happened to her, as she isn't that old. We got her when she was still a "preteen" in the Spring. So its only been 6-7 months and 3 days ago I found her with scabs on her neck, which wasn't too uncommon. Her and her sisters have gotten into scraps before and we generally let them resolve it. And no one comes out with more than a scratch, but then 3 days ago I heard a lot of tussling, and a loud squeal. I went and investigated, and all three had scattered to opposite sides and levels of their cage. Yolandi at the time seemed fine, no blood, no marks. 2 days ago, I find her missing a patch of hair on her neck with a scab, and now she flinches and pushes away when I touch the side of her face. Even literally hisses in pain, and now she just moves very slowly. She's lost weight, still eats and drinks water. But she's very cautious, not the active, loving, licking rat me and my girlfriend know. We moved her to her own cage to keep her away from her sisters and to keep from falling off the ramps in the main cage. And we think she was suffering from depression from being seperated from her pack. Today she seems a little more in tune with the world, she still moves slowly, wobbles about, doesn't seem in as much pain. But I'm just prepared to find her stiff without any warning at this point.