Avapro is relatively weak and won't get you from 167 to 140 or anything like that. You mom needs to revisit her whole regimen with an MD who's actually thinking. I agree that the occasional water pill makes no sense. Based on my only relative success, I would say switch to another CCB--some version of Diltiazem--and rapidly
work her up the maximum dose, and maybe mix that with Avalide (a combo avapro/diuretic), if need be aiming at the maximum (300) dose there too. She has a long way to go and has to do it prevent those horrible diabetic complications like kidney disease.