How To Reduce The Elevated Creatinine Levels?

My mother s creatinine level has increased to 7.4 and she has fever attacks twice or thrice in a day at certain time. we have checked for all the possible issue but the reports are coming fine. Its just that her creatinine has increased too much and she s become weak as she is not eating much and also advised bybthe doctor not to eat much. Though she has no other issues like lever pain, vomiting, not even with urination. Currenty she is admitted to Hospital where we have started the treatment but we would like to have an opinion with a nephrologist. we are constantly checking on the reports.and we have done urine culture, typhoid, sonography, x.ray chest P.A.