Oh my.... this is so sad. I know what it is like waiting, and not wanting to see the end. I also know that I can't stand to see an beloved pet suffer, and that I will not go to extreme means to keep the pet alive, if it does not add to the quality of his/her life. Sometimes you just have to do what is best for the pet, and not think about how lost you feel. It's a horrible feeling, but if she's telling you it's time, then it's something you will have to do for her, not for you. I know what it is like second guessing as well. Should I do this? Did I do the right thing? What if.... It's all just torture.

When the time is right for Fluffy, you will know. Like the others told me, it does sound cliche, but she will let you know when she has had enough and just wants peace.

Be brave for her, and when it is time, help her to find that peace.