Thanks for asking.. HEPATITIS C should be treated as early as possible since once it get chronic it become rather difficult to eradicate the virus...i advise ur mother to get a blood tests done called QUANTITATIVE PCR FOR HCV and HCV GENOTYPING..plus baselines FBC, LFTs and ULTRASOUND ABDOMEN AND PELVIS.... previously they are using interferon injections for treatment the duration for which varies : 6 months treatment for genotype 2 and 3 INTERFERON + ribavirin 12 months treatment for genotype 1 and 4 INTERFERON + ribavirin Now new drug by the name SOVALDI SOFOSBUVIR is launched ..IT has got 95% cure rate for all genotypes. plus point is that it is free of the side effects which pt experiences of INTERFERON.second its a pill easy to take ..it will replace interferon in future... Coming towards the other symptoms like excessive thirst an drowsiness , research studies shows a VERY STRONG ASSOCIATION BETWEEN HEPATITIS C AND DIABETES.. so check her random glucose levels plus HbA1c levels..to rule out DIABETES Last but not the least is constipation and disorientation.....they may signifies the HEPATIC ENCEPHALOPATHY one of complications of chronic liver disease get her ultrasound done to look for LIVER TEXTURE , ASCITES , PORTAL VEIN DIAMETER AND SIZE OF SPLEEN....avoid constipation and use stool softeners and ISPAGHOL HUSK.... HOPE I WILL BE ABLE TO ANSWER YOUR QUESTION IF U STILL HAVE ANY QUERRIES FEEL FREE TO ASK.. REGARDS..