Invasive Ductile Carcinoma Nottingham grade 3

My sister was just diagnosed with Invasive Ductile Carcinoma g3.

She lives in Zimbabwe and I live in the UK… I dont know what to do, im the baby of the family, and theres no family there to help her. She has a son and is also in an extremely abusive relationship. Shes asked me to organise custody of my nephew so that if she dies I get guardianship. 

Zimbabwes healthcare system has collapsed over the years, they literally only have one radiotherapy machine in the whole country! And its prone to being out of order.

Shes asked me to do a *** to help her pay for her treatments, which a friend is going to help me set up because i have zero clue. 

I was thinking, if anyone knows if its possible for her to come here and get treatment instead? If so, how do I do that?