Diet options for stage 4 gut & liver cancer

Hi All

First time posting here. My mum was diagnosed with stage 4 metastatic Liver cancer on Thursday. She's 60 years old and has been told we only have months, not years. Primary is within her gut and secondary is the liver.

 

I need to keep my brain occupied so wanted to look into best things for her to eat, she's not able to eat big meals but want to try provide her with a nutritionally balanced diet to help keep her immune system as good as it can be.

 

Does anyone have any ideas or advice?