My 4 yr old daughter has enlarged kidney and she has debris in her bladder, what's going on?

Further evaluation . This will need further evaluation by a pediatric nephrologist. Big kidneys might indicates: 1-inflammatory condition of the kidney (nephritis) associated with blood&/or protein in the urine 2-kidneys filled with urine because of obstruction (hydronephrosis) beyond the kidney 3-infection of the kidneys (pyelonephritis) 4-other benign conditions or non benign conditions recommend further evaluation.