Hi. Thanks for your query and an elucidate history. Noted the history of kidney biopsy , hematuria in past and now after 4 weeks after the kidney biopsy. The most probable cause looks to be your Mother in Law is having cancer of the kidney. I would advise urgent CT scan / MRI for the urogenital system to find the cause of bleeding, the extent of involvement of the tissues, the nature of spread of the cancer is this is so and to get an appropriate treatment. She may need an admission to the hospital and blood transfusion if the bleeding is severe .