Does diabetes run in your family? Maybe you should have blood work done. Only thing test have to be specially for lupus it does not show up.

Could be diabetes does the same thing so get her checked

She might have Sjogren's, it's autoimmune related. Wishing you both the best.

Dry mouth happens all the time. I also use a mouthwash called Biotene for dry mouth.🙏💙☺️👌💪💙

It happens to me when I flare because I have kidney involvement so I have cut out sodium but I would watch out thirst/dry mouth is a symptom of diabetes or sjogren's