Has she ever had some probiotics (ie good bacteria supplements)? If she has ever been on antibiotics, it kills off both good and bad bacteria, but you need to replenish good bacteria. In the past docs prescribed probiotics when patients were on antibiotics, now they don’t, and people wonder why they have so many more gut and stomach problems now.
My mother has been on low dose antibiotics for years because of a chronic bladder infection that just won’t go away. My guess is you are right.
Bring out the yogurt, right? (Good bacteria)