I had emergency Gall Bladder surgery about 1 1/2 months ago. I was in TERRIBLE pain, and I also had Pancreatitus. I know there wasn't too much time for a flush for me, because I was knocking on heven's door. I wish I knew about flushing before, though. I CERTAINLY would have done it if I had the time and the know how, because life after Gall Bladder removal is bland foodwise and painful (even though they told me I'd be good as new in a week). Unfortunately I never thought of my gall bladder before. NOW I have my whole family and some friends all thinking about their liver and gall bladder.
If your friend can do the flush it would probably not hurt her, but when I had an attack from some stuck stones, I was VERY ill. She'll know it if it gets stuck. In that case, she should go DIRECTLY to the hospital. Mine always passed, and I'm sure many people here can tell you about "attacks" that they have experianced. It was worse then labor for me, and I hear it mimics and is as painful and scarey as a heart attack. I tell you I was scared the last time I had one.