Leaving mum for holiday

I have posted on here that my mum was diagnosed with glioblastoma 6/7 weeks ago, she was given 6 months but started to deteriorate 10 days ago, she was out in a string driver. She has basically been the same for the last 10 days with no further decline, not really eating and drinking small amounts. We have a holiday booked for 10 days and we go in 2 days time, my family have told me I should go and I know my mum would want me to go and I really don't want to be there when anything happens to her but I feel guilty for going and leaving the rest of the family to deal with everything , I want to go for a bit of normality and to be honest I don't feel that the person in the bed is really my mum anymore , I feel she has already gone, I just don't know what to do