Bladder infection. Permanent solution?

My mother is suffering from urine infection and their a polyp in uterus. From Jaipur golden hosp,she removed that polyp in the year 2017.After that she always suffers from urine infection, maybe 3-4times in a year. We tried many treatments, we contacted many gynecologist during this period.But after a certain period of treatment,the prob again comes.From 2017 to 2021 she is suffering from the same prob. At the end we contacted a uro-gyne,she briefly told us the actual prob, that's is the bladder prob. Mom had menopause in age 42.That's the main prob behind this bladder infection. She prescribed us a medicine that is Soliten 5mg. Mom taking this medicine from 7months and she is very well now.Doc said that mom can't take that medicine for whole life because after a certain period of time medicines stop working in our body. She advice us for the bladder exercise and it's little bit costly. So please advise us if we get it done,this prob will not come again?what's the permanent solution?