HOW TO AVOID GALL BLADDER ATTACKS???

Those of you who have had them, what have you learned triggers them? And then, what do you do to get relief, other than the flushes?
I am trying to help my mother who had a recent very severe attack. She is old and frail, so the regular flushes are not a consideration, neither is surgery.
I am wondering if anyone has had good results with the mini cleanse where you take one Tbs. of olive oil plus juice of a lemon all blended with a cup of water, drunk first thing in morning? Could this process trigger an attack??? Can the "good" oils ( cold pressed flax seed oil, extra virgin olive oil etc>) trigger an attack???