I’m sorry that you are going through this. I can tell how much you and your husband love Molly and how you have tried to give her the best care for all of her ailments. I have had several rabbits over the years and 6 had to be euthanized. It is never easy to say goodbye, even when you know that you are doing the right thing and you are ending their suffering.
At my current vet, there is a room that you can be in with your rabbit, to spend a little time with him or her before the procedure. Don’t feel like you have to hold back your tears. They know how sad it is for the people. Then you let them know when you are ready. Some people want to go back to the room where the rabbit will be euthanized, and maybe even to hold the rabbit, but for other people, it may be too sad and they say their final goodbyes and give their last kiss beforehand.
If you plan to bury her, you may want to take a box with you, and place a small blanket or towel or a piece of your clothing in it, to wrap around your bunny. The vet will probably have some boxes, but it’s good to have one with you too, in case you want one that’s a particular size.
Molly knows how much you love her and how well you have cared for her and that you want to help her be free of pain.