Thanks for writing your query.
There is a possibility that your mother has got Urinary Tract
You should get her investigated for following:-
1. Blood sugar (Fasting and PP)
3. Urine (Routine/Microscopic and Culture/Senstivity)
If she flushes the toilet after every use, it can not be transmitted to others.
Treatment can be planned according to the reports of the investigations.
I hope this is helpful to you.