OMGoodness! I am so sorry.
I cannot really give any advice on whether or not there is something medical going on, but maybe look at things like her food...what's in it, maybe she's sensitive to something in it, etc....and everything she can get her mouth on. Maybe isolate her to an xpen or gate off a 'safe' room for a few days, or keep her with you so you can see everything that she can get to. I'd be suspect of anything she can lick, including anything used on her, floors, cabinetry, etc. as far as cleaning products, laundry stuff, etc. There is
some reason, even if it is not obvious yet. Please update, though...concern here is genuine!