Hey mate, sorry to hear about your grandmother.
Firstly i can only give you very general information because i don't have all the facts about your grandmother's condition, specifically the exact condition of her liver at present and why exactly she is getting chemo and what kind.
Nonetheless NASH in itself is not a very serious condition and tends to cause little or no symptoms. While it can as you said lead to more serious liver disease such as cirrhosis, the condition can in a best cause remit (improve) and in the worst case still tends to take years, sometimes even decades to progress.
With the exception of me not knowing about the chemo, the upshot is that this may not affect your grandmother's life too much right at the moment and it may not change her medical treatment (for her diabetes or any other conditions) very much. The general advice given to all patients with diabetes; weight loss if possible, balanced diet, exercise if possible and not drinking excessively, still holds true.
If you are still worried the best thing i can suggest to you is do a little bit of reading, write down the questions that you have and pose them to your grandmother's doctor if you have the opportunity.







