Amanda,
So good to get that update! I'm sure everyone from this thread has been waiting to hear, and rooting for Maggie.
It sounds to me like your head is in a good place and you are getting prepared for all possibilities. All of you are doing everything possible.
When Maggie comes home be sure to mix some water into her food to add yet another source of water into her. Water is the key for flushing natural waste toxins out of her body that her kidneys cannot. Maybe try to make her food like a thick soup.
I have to tell you one more thing because your last post made me think of it...
When I left Pearl that critical weekend on IV at her vet's, my vet tried to prepare me for the worst- she said to me that I should know that she had never had a cat survive with lab test numbers as poor as Pearl's were. Three years later, I always kid her about that when I bring Pearl in for one thing or another, and she always says how Pearl proved her wrong and made her change her mind about what was 'hopeless'.
I think there is always hope when your pet is still eating and acting happy to see you. If Maggie is not going to make it, you can feel good that you gave her every chance short of letting her suffer in pain. And when Maggie's time comes (whether this week or 3 years from now) you will be lovingly there for her.

