I am very sorry for your loss and will try to help answer your questions.
First, I have a couple of questions:
How old was Appolonia?
In May, aside from her elevated WBC count, were there any other abnormalities noted on the lab work?
When she got sick again in September, what other lab abnormalities were noted? You mention liver failure, was there an indication of this on lab work, and if so, when was the first time these values were elevated?
Were chest and abdominal xrays done at any time to determine if there appeared to be cancer in the liver and/or lungs?
If you can reply, I will try to help answer your questions.