I feel for both of you. Your present, the butterfly garden sounds just lovely (heck I want one now).
Are there any childrens books on death that you could buy and read to her? Her attachment to doob is very touching. Sounds like the puppy is too much for her right now as she is still grieving. Heck I am an elder and I won't let this new pup/dog of 1 year play with Side's special toys. Can you find a grief counselor in your area to talk to about her and maybe get some ideas on what you could do? If you call hospice places and explain the situation I am sure a counselor would be happy to help you and her. A good grief counselor does not treat human death or pet death any differently, I know as I have one. It sounds like doobs was a soulmate for your little one, and that it is truly touching.
"People disappoint, dogs never do" - spiritdog
"You MUST be your pets ADVOCATE, if it doesn't feel right walk away." - spiritdog