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Thanks so much for requesting me. Vocalizing at night can be due to hyperthyroid. However, right now I am more concerned about her weakness and laying in the tub.
I think she may be very dehydrated which is also causing her constipation. She should be seen by a vet today ASAP for subQ fluids.
In the meantime offer her whole milk.It is a natural laxative which should produce stools within two hours and hydrate her as well.
Please let me know how she is doing. Reply here or if you prefer we can speak on the phone.