Talk to Urologist on Frequent Urination

AoA! My mother 69 years old. Presently she has been suffering with frequent urination. This problem occurs twice a year approx. ECG and USG Reports attached. Other tests like Urine C/E, BS Fasting, Anti HCV, HBsAG, RFT are Normal. Plz inform that its due to Gallblader stone or some thing else.