My Neighbor Is An 81 Yr Old Woman. Recently She

My neighbor is an 81 yr old woman. Recently she discovered blood in her stool and is constantly tired. In and out of the hospital over last few wks, she is no longer bleeding, red blood count was finally over 8 last wk when she left the hospital but is still complaining of being tired and no appetite. Her blood pressure is still low. White blood count and liver functions are both normal . Drs at the hospital say they don't understand why. Any ideas what we can ask them to ck for.