My mother is partial unconscious. Test,

My mother is a dialysis patient. She goes for dialysis two days a week. She also has l3 and l4 fracture due to osteoporosis. Suddenly on one day after dialysis she was talking some non sense and signs of forgetfulness. Next day her BP shoots 170 and she is sleeping a lot and her eyes are not opening properly. She is feeling cold alot and shivering too. Next day difficulty waking up and BP is 190. Responding very late. Admitted in hospital then she stopped talking normally. She is trembling while sleeping and lot of restlessness. ECG is done, chest cat scan. Usg, blood tests to diagnose any infection. Brain ct scan. LP test, thanks to god is satisfactory. Doctors are unable to diagnose why she is behaving like this suddenly. Please advise what tests we can do to diagnose the same. Also while doing dialysis her BP lowers down usually. Creatinine is 5.5. Sodium, potassium, electrolytes are in range.