How heartbreaking and stressful
The extra space outside could definitely have done it. There may have even been smells from other animals or even wild bunnies that set them off. Maybe in concert with a tenuous trio since Douglas passed?
So if I read this correctly, Charlie and Bobbie are still bonded and are together? If so, please observe them very carefully, as it is possible for them to have some problems as well since the trio has been disrupted.
Since they are fighting, you actually WANT them to forget each other. The fact that Lola is fighting and circling with the others means that her bond with them has already broken.
It would be a good idea to have all three rabbits examined at the vet (not just Bobbie). It’s possible that Lola is having an issue that caused her to feel insecure and lash out.
So sorry you are dealing with this. Since the fight was so bad, and they were a tough bond to begin with, you might consider keeping Lola separate, and possibly rebonding her with a new bun to have two pairs. Especially if Bobbie is older, it might be kinder to her to not put her through the stress of another tough trio bond.
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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.