I would kinda check her out all over, see if any one particular place seems to bother her. Check her little butt in case she's got some poop stuck to the hairs back there. See if there's something in the dining room that's possibly scaring her. Check for fever, see if she has to potty and maybe can't. Other than that, I can't think of anything. I sure hope she's okay!
Maybe she's scared that the crazy trainer will come back.