I agree with bone. She's going to need to keep doing the flushes, but she also needs to handle the other factors leading up to it, which are parasites, colon cleansing, and possibly kidney cleansing.
As for fearing eating at night... fasting at night has its benefits.
I had attacks from mere orange juice (what fat?!?), so I got tired of dealing with the attacks REAL fast. Fat free foods? Attack. Protein? Attack. Acidic foods? Attack. It was annoying.
How about castor oil packs (w/ heating pad)? Those worked well for me when I was having attacks.
You could also look into Gold Coin Grass tincture or other methods to help dissolve gall stones.