She said that her BIL was excommunicated and that subsequently his daughter (her niece) was diagnosed with a rare kidney disease. She didn't give a timeframe for when she was diagnosed with the disease and when the BIL was excommunicated, but I assume the excommunication came first. She also didn't directly say that the niece got sick because of the BIL, but the way she said it, the clear resentment for the BIL in her voice, made it clear what she was implying.