So sorry to hear about your daughter - it is such a sad but supprisingly normal tale I am discovering, through reading peoples discovery journeys, with this form of cancer.
Your story is so real to me - it made me cry as soon as I read it.
My lovely Mum was diagnosed with exactly the same as your daughter - Stage 4 - started from a large tumour in the bowl/colon and then has gone into multiple mets in her liver and lung.
Mum (aged 66) had the same symptoms as your daughter - pain in her side and back - but thought she had pulled a muscle gardening or maybe indigestion/gall-bladder - we didnt really know. But nothing can prepare you for the shock of that day when the diagnosis comes.....it knocks the stuffing out of you - and replaces it with sadness.
Our lives were turned up-side down, like yours were, on the 28th of November 2011 - Mum has been told it is terminal and inoperable and has had the same chat as your daughter had, about palliative chemo and quality of remaining life.
Mum has just completed a set of 4 chemo treatments in blocks of 2 weeks over the last 3 months and they have now given her a little break of 5-6 weeks. They called it her 'window of opportunity' so that she could do something she wanted before .........who knows what comes next.
Mum chose to go on a little 5 day break with my Dad to The Lakes in the UK where she always wanted to go.
"One last holiday" she said to me - those words just break my heart.
I cant fully imagine the pain you have gone through in losing her, the living grief is bad enough - but unfortunately I know I will also have to face it.
I hope that you can find more peace in time - the one thing I think life has taught me more than anything is: Life isnt fair- quite frankly it sometimes stinks.
God bless you x