I wish her the best, but please keep a few points in mind that are relevant to your situation.
Just because someone is elderly and confused....it doesn't automatically mean that there's dementia on board.
Sometimes elderly people become vitamin difficient, they have an interraction with new meds.
Also, there's another process that you need to be aware of.
When you get older, your kidneys and liver (the organs that clean and filter your blood) don't work as efficiently.
This means that medications can build up to dangerous levels in the bloodstream even if the patient is using the perscribed dosage.
Every paramedic, ER nurse, emergency physician, and so on is always aware of this, as--historically--there have been bad misunderstandings when the labwork came back to the ER.
Devout Catholics have been Baker-Acted (a kind of involuntary psychiatric commital that lasts 72 hours) and put on suicide watch because the doctor attributed the high doses of medication to a suicide attempt by deliberate overdose.
People have been disowned by their religious families over this.
So, make sure that she isn't walking around with a shitload of extra medication in her bloodstream because her liver and kidneys aren't what they used to be.
In situations like this, some lab tests and a few days of observation....along with the doctor adjusting dosages....can have her fixed as right as rain.
I hope this helps you.