Oh noooo! I am so so sorry
Just spoil her rotten. I went through the same thing with my first dog Boomer. It's all I could do...fed him all of his favorite things, peanut butter, cottage cheese, hamburger, you name it. He actually gained weight towards the end. I'm just so glad I spent as much time with him as I could, and boy, did he know he was loved (I hope!).
I know some people take pictures on the last day, but I couldn't bring myself to...just too devastating, and some take locks of their best friend's fur when they know the time is near.
I am so sorry about Abby and that you and your family have to go through this...it is never ever easy to let them go.
I got a paw print that day I lost my boy, and I picked up his ashes later. I now have a shrine to him with his pictures and sympathy cards, the paw print and his collar
Feels like yesterday, and I still bawl like a baby thinking about it.
Hugs to you and Abby.