terminal cancer

Hi I had my mum moved in with me a couple of weeks  ago has she has stage 4 cancer 

I w as told in February that she had 3-9 mths to live.

My mum sleeps so much and doesn't eat a great deal.

I worry so much as I dont know what to expect in the future

I dont know if his is normal behavior and I dont know if she is nearing the end

Any help would be appreciated