You basically must have a holy candle, put it in the hall before entering room 105 and picking the umbilical cord. Turn on the holy candle next to her, then eventually move her as close as possible to the candle. Unless she is all covered in blood you will see her wounds disappearing. Now BEFORE the candle stops burning, run to room 105 and pick up the umbilical cord. You will trigger a cutscene, and she will be healed. It's not easy, so you will have to do it at least two or three times.