I am so sorry to read about your mum and the terrible time you are having. Facing up to possibly losing a parent is never easy and very sad. Caring for them feels so unnatural and takes an immense amount of strength and courage. My dad died 6 weeks ago and leading up to his death we did everything we could to find better treatments, more help and support, our doctors were probably sick of us ringing them, etc. Now he is gone we feel comfort knowing we tried everything, although ultimately he died much sooner than we ever thought he would. What it has taught me is that you should do what is right for your mum and what your instinct tells you. What would or does your mum want you to do? I think ultimately you probably already know what you want to do, go with your that. Take care and I am sending you lots of strength and courage.