Talk to Gastroenterologist on Loose Motion

my mother having loose motion after some days for 3 weeks.....unko pichle week drip lagwai us mn inj.onset and dicloran b lga and inj.risek,nospa....phir theek hogaein dubara phir start hue motion then phir thora time theek hone k baad again start hogae......I am giving ORS after every motion.she taking soft meal but jab darmian mn theek huein toh roti waghaira b khai and stool b sahi tha but ab again problem hogai hai aur unka weight b kam hai 48 kg tak hai boht weakness mehsoos kr rahi hain.. kia unko mazeed drip lagwani chahiye ya koi medication.plz guide me.