It is a very tricky situation Michelle, as they can't fully tell us how they are feeling, but it is better to let them go a week early than make them suffer for one day. i have seen what happens when people leave it too late to pts, and it isn't pleasant for the animals, so I wouldnt take too much notice of your mum - at the end of the day Issey is yours, you know her best and you and your vet will decide if there is hope with treatment - and you have tried so much for her, she coudn't have asked for a better mum. xx I really feel for you, I know how hard it is to weigh up with a terminal illness, and the fact she is so young makes it even worse.