Welcome to NeuroTalk.
The elderly do get low sodium spells. This is called hyponatremia. But drinking MORE water is usually not the solution to that. So I am confused about that advice.
If she were just dehydrated, that would be a different situation.
Here is more on the subject
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC1071707/
Antidepressants in the SSRI category also may cause this but rarely.
Also, some elderly patients when traumatized develop low thyroid in response. So I'd make sure they did a thyroid test on her while she was in the hosptial. Low thyroid can give mental confusion symptoms.
You know when a person hits their head, the brain can move about inside the skull and other parts may be damaged.
There is also a condition called normal pressure hydrocephalus:
http://www.lifenph.com/
This can present with cognitive issues, incontinence etc. The blow to the head may disrupt the circulation of spinal fluid, and if it builds up it can cause this.
http://www.lifenph.com/symptoms.asp
It can be very difficult with a very elderly patient therefore.
I think you'll need to see more doctors, and perhaps get another opinion.
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All truths are easy to understand once they are discovered; the point is to discover them.-- Galileo Galilei
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Weezie looking at petunias 8.25.2017
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