Dental issues/pain/infection can cause a multitude of issues. Periodontal disease? Pain?
If it was my dog I would make an appointment with a veterinarian and have her seen asap.
Today, if possible. They will probably recommend a senior workup, lab work etc.
I would even consider taking her to the emergency vet if you think she is in pain or is not eating/consuming adequate fluids x 72 hours.
It is what it is, this is part of pet ownership. No one on the internet can diagnose your dog and prescribe treatment. Get her examined by a veterinarian….that is my advise.
