At 9 and lots of water...it is time for bloodwork/urinalysis. One of the big RED FLAGs of vet medicine is changes in water consumption. It is an early indicator for kidney disease, diabetes, endocrine problems, etc.
The tapeworm issue will not cause this. Please make an appointment and get her checked.
Dr.V
Dr. D.A. Vamvakias
Veterinarian