Kidney stone. Positioned at lower pole.

My.mom is diagonized with 15*9 mm on aug 28 stone .earlier it was 16*9 on May 28.she is diabetic(under control) and had bacterial infection which had to be treated first to operate her stone .we were mentally upset as surgery is a risky operation for her at this age .her blood and urine tests are ok .creatine is ok.kidney and liver is functioning fine.but bacterial keeps forming due to the stone even though bacteria was recently cleared using niftran 100 mg.we wanted to know if there is an way to dissolve her stone without a surgery at this age .she sometimes develops fever due to this and it has become important to decide whether to crush the stone or try for alternatives like homeopathy.but we don't know which one would work since homeopathy might take long time to treat her stone and allopathic might lead to risky surgeries.please suggest the best path for dissolving the stone s.her blood count , stone is positioned at lower pole.