My Mum has terminal bowel cancer

My mum has distal transverse colon cancer with multiple liver metastases, she's in her 70s and because of other health isdues she's on palliative care only to make her comfortable, so just pain relief. I'm meeting with the colecterol surgeon next week on my own to go over any other questions. We just want to know how much time we have left with mum but no one can give us the answer, i know its only an estimate. It's really hard. She's currently in a nursing home where she can stay as they can provide palliative care. It's a lovely home. 

Mum is really tired at the moment but otherwise OK. She's already double incontinent and is in a wheelchair.

I absolutely live her her so much and it totally bresks my heart as we lost dad to cancer and its such an awful time

Anyone else in a similar position.