No matter what it is...the woman is in poor health and is probably doing this because she has favors to pay back.
If people around her loved her, they would not have let her put herself through this. I feel bad for her.
Although she may have overruled their objections in her quest for power.
She is doing it because she wants to be the first woman elected president, regardless if she lives out the term or not, or even if cannot really govern. She is more than willing to put her health at risk for her chance at being president to the detriment of everything else or anyone else.