I’m so sorry for your loss. 🙁 Was your current bunny able to spend time with the body after she passed? Usually that helps the surviving rabbit understand the loss and they cope much better.
In the immediate time after, monitor her eating and pooping. She may be a bit quieter than normal, but should still eat and poop normally. if not, she may need some supportive veterinary care.
She will appreciate you spending extra time with her, even if you are just hanging out in the room with her reading or watching TV. Some rabbits like having a “stuffy” to cuddle with as well, just monitor to make sure she doesn’t chew on it.
If you are up for it, you might consider re-bonding her with another bunny in the future. You don’t need to rush into it, but most rabbits that have been bonded before are happier if they are re-bonded. She would need to be spayed if she hasn’t been already.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.