Very glad to hear that you and Pusser are going to the vet on Monday. I say this for the fact that a hands on evaluation will be absolutely the best thing to determine what is going on with your little girl. In saying that though, I hope I can prepare you for some things that they will be evaluating her for.
One of the first things that they are going to look for is something going on inside her ears - an inner ear infection
. This can be due to bacteria or yeast and it can irritate them or their inner ear to the point that they will tip their head or loose their balance.
For some older ones they can have a sudden loss of balance due to vestibular disease - this can be due to trauma or pressure on the inner ear. In a lot of cases this is an event that has know known cause - it is caused idiopathic vestibular disease. The good thing about these cases is that it usually gets better all on its own. It may take up to a week or so. But to make this diagnosis, you have to rule out inner ear polyps, cancer, and inner ear infections.
Here is a link on the vestibuar disease.
Here is a link on the polyps.
Here is a link on ear infections.
At this point in time, it is good that your little one is still acting normal in the other things that she's doing - not loosing weight, not having vomiting, diarrhea
, and no loss of appetite. I'm willing to bet that your vet will want to do a thorough ear evaluation, physical exam, blood work and films to help them figure out Pusser's problem.
I'm hoping all goes well,