Rabbit Death, Bereaved Companion

Hello,
   
My beloved male bunny Cocoa, whom we adopted 3 years ago passed away yesterday. He had swollen genitals in which we were giving him antibiotics for. Yesterday we were trying to give him his medicine and he was moving and fussing around a lot and I guess some got into his lungs or something and he was having difficulty breathing. We rushed him to the vet where he passed away. We were so heartbroken and sad at the moment that we weren't thinking straight and did not want to see Cocoa laying dead for very long. It was only when we came home that we realized that we should have brought the body home for our bereached bunny, Domingo, who is the much beloved mate of Cocoa. It was too late when we called the vet and I feel horrible that Domingo could not spend that time with Cocoa's body.
   
Now I am so scared for Domingo because she is sulking around I am afraid that she does not know what happened to Cocoa and is left "waiting" for him, this brings me to tears to se her by herself!!! What can I do to help her during this grieving process? How will she know he has passed away? Should I introduce her to a new companion and when?? She lived by herself for a year before we adopted Cocoa and is the stronger of the two. She is doing okay so far - eating, drinking, running around and accepting lots of snacks, but I fear that in a few days when she starts to realize Cocoa is not coming home, she will get even more depressed. What do I do?
   
Thank You,
   
Jessica

Actually, the longer the time, the better the mental state of a rabbit. They notice the lack of their companions immediately, not a few days later. It's dogs & cats & other predator animals that realize a little later that their friends aren't coming back & THEN get depressed.
   
Yes, she misses him, but since she's eating & drinking & playing more or less normally, she's unlikely to become depressed. Depressed rabbits don't eat & hop around. She's missing the fun & company, really.
   
A rabbit is a prey animal; their brains are wired for survival. When one of their family/group disappears, it's normal for them. Their brains aren't wired to dwell on it, because that would distract from surviving. So it's in the past pretty quickly.
   
And since she had a year alone, she's used to being just with you. And she accepted a new friend before, I think she could do it again.
   
I'd give it a week or two. Clean up all the equipment used by Cocoa & wash all the bedding. Clean out the rabbit hutch, wash it & put in new straw. Start her out fresh with just her smell. Then it won't be so confusing when a new rabbit comes in smelling different from Cocoa; she'll be used to Cocoa being gone & the new rabbit can start fresh. And I'd suggest getting a rabbit that isn't the same color as Cocoa, to set the new friend apart even more.