Hi Nippy.
It sounds to me like your sister is depressed.
Chemo can take an awful toll on the body making you susceptible to all sorts of problems and the thought of going through a SCT, which can be bad, will be playing on her mind and adding to the problems. Does your sister have access to a counsellor? They are a great help.
Anyway those are my initial thoughts. I’m sure others will have other views.
Every day is a gift.
Andy xx