It would be uncommon for an indoor only adult cat to develop ear mites. SHe may very likely have an ear infection, but it may not be due to ear mites. If the ear infection involves the middle/inner ear it can affect what is called the vestibular nerve. The vestibular nerve controls her sense of balance and if that is affected, she may feel vertigo or feel like the room is spinning. If that is the case, it may make her feel nauseous (some cats drool if nauseous) and that may be why she is hiding. Of course, there could be many other reasons for her to be drooling and sequestering herself. Cats are very good at hiding their illness, and I think you have very good reason to be concerned.
Your best course of action would be to have her examined as soon as you can, even if that means finding a vet that can see her over the weekend. Without knowing what in in the meds, it is hard to say if they could possibly be involved, but even if not, something is definitely wrong and should be followed up on. Cats are so good at hiding their illness, that often by they time they let us know something is wrong, they are sicker than they appear.
I hope this is helpful. Please let me know if you have ANY other questions. My goal is to give you 100% satisfaction and if you are not yet satisfied, please reply so I can clarify for you.
My posted replies are for general education only and not meant as a diagnosis. Only after a thorough veterinary examination can a diagnosis for your pet be made and specific treatments be advised or medications be prescribed.