I'm so so sorry to hear of your loss. I have a little male dog about to turn 10 and he is my whole world and I often dread / think about the loss of him and how it will absolutely rip my world apart.
I had no idea when I got him it would take over my whole life and he would be at the centre of it with his funny, demanding, bossy little ways. Clicking about on the laminate with his little paws, spilling water everywhere, pushing cushions off the sofa, bunching up the rugs, pulling his toys all over the house, barking at the window. I know what you mean about the quiet without them. I have had a few times he has been in the hospital for one or two nights and oh my god the silence is deafening. Obviously not the same at all as you are going through but even on those occassions I have to keep myself busy and remind myself he will be home soon as I miss him so much. We give them our whole hearts and in return they become our faithful, loving, utterly loyal friends. Accepting us at our worst, not caring if we are rubbish at things or looking ugly or fat. You are never alone when you have a furry friend.
I also understand what you mean about thinking of her waiting that day for you to collect her and hating being in a cage. I think just remember it was only one day in her ten years and she won't remember it now. From doggie heaven she will only remember the thousands and thousands of fun, loving, happy, snuggly days with you eating her favourite treats, playing with her toys, sleeping on your bed. I like to think when they go to doggie heaven they are reunited with their doggie mum and doggie brothers and sisters so they have a family there and are not lonely or sad. I also like to think they know you will be with her again one day.
My neighbours had a bichon frise who used to snuffle and bark at the fence and my dog would do it back on the other side. They were both 7 at that time. One day the bichon went to the vet with something 'ordinary' and ended up dying. When my neighbour told me I was so upset for about 2 weeks and it wasn't even my dog. My neighbour spent the next year doing lots of travelling. She said she couldn't bear to be in the house without her beloved little bichon. Even I felt quite sad that the wee dog next dog was not there for that year and it made me really, really appreciate my own wee dog. She did get another bichon after that year and is now happy again and head over heels in love with it. Not forgetting the first bichon of course and she has lots of his pictures in her house.
For me my little lad is having more and more problems with his health. He got diagnosed with a heart murmour this year and I spent 2 weeks taking him to his favourite parks, playing with his toys/balls lots, giving him all his favourite meals and buying him a huge sheepskin rug (he loves sheepskin but the huge ones are expensive so I never had bought any bigger than the small ones before). Thankfully his heart murmour is age related and mild at this stage. I was so relieved when I found this out as I lived the whole 2 weeks thinking each day might be the beginning of the end. He has had teeth removed this year (absess) and gets lots of lumps and bumps now which cost a fortune to get tested and removed if they are annoying him.
I try to prepare myself for the fact he may only have a few more years left though I hope to have him to at least 14, hopefully 16 (he is small and a crossbreed).
I have been through some terrible times missing him and once when he had had some surgery and the vet was updating me I was practically jumping up and down and wanted to say 'please just bring him out so I can cuddle him and see him' then you can talk all you want. I was literally desperate to see him, touch him, cuddle him and reassure him. It was actually painful.
Please try and focus if you can not on that last day which she won't remember now but on all the nice days she had and how happy she was. Also try and think of her now being looked after by her doggie mum and doggie brothers/sisters so not sad or lonely whilst looking down on your fondly.
Huge hugs and sympathy xxxx