Hi The problem you have outlined does not appear to be due to a kidney issue (though dehydration may worsen an acute kidney injury). This sounds more like a bacillary or amoebic dysentery or gastroenteritis which could have been contracted during her travels to a new country. I suggest she takes plenty of fluids if her kidneys are doing well, and as a matter of fact, replenish her oral salts every time she passes a loose stool. She might need to take some probiotics and antibacterials and anti-amebic drugs but staying hydrated is most important right now.