My Mom Is 78 Years Old She Is Battling Lung

my mom is 78 years old she is battling lung cancer I came home in Feb 2016 to take care of her we have Hospice set up in the home it's been all most a year now I notice a change she is bed written now she has not eaten food in 17 days her water in take has gone from 24ox a day to not even 8oz per day she sleeps all day and all night she is not putting out the urine she use to in her bag and its dark her eyes have turn gray and they look like a layer of glass over them and she talks out of her head some times what little talking she do she keep telling me that she is ready to die and she keep telling me that its not going to be to much longer all I can say she is a real fighter and a great mom