I watched my grandfather pass from lung cancer. I don't know what her exact signs will be due to leukemia but from our experience about 24 hours before he passed away he wasn't hungry and couldn't eat dinner the night before, the next morning his blood pressure was really low, still no appetite and he felt the urge to urinate but was unable to go due to his kidneys beginning to shut down. They put a catheter in that morning, and he passed away at 5pm that night. I'm sorry for what you all must be going through.
My mother passed away from AML acute myo. Leukemia, she ate with all her family and few friends, ant simple went to sleep, The pain that you feel will be easier with time, but know that your in our thoughts and prayers as you deal with your family's health issues.
Kidneys start to shut down, loss of appetite