Hi there,
So I think once she appears healthy, you can start bonding! Before then, you might actually start swapping litter trays (when they are a bit dirty). The bacteria from the other bunnies can actually help get her gut flora healthier again. But if she doesn’t currently have weird poops or GI symptoms, then she probably is well on her way to being back to normal.
I had a dental abscess bun that was on a long course of penicillin injections, and his gut seemed to handle it better than I expected. Encouraging as much hay as possible is really the best way to establish healthy gut flora. You can even crush up some of the other bunnies’ poops on her hay as an extra …. seems gross but my vet recommended it!
Once you start bonding, just be on the look out for signs she is getting overly stressed and go at her pace. You can work with all three together, or just focus on the two females at first since that seems like it will need the most work.
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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.