Most bunnies when they go through adolescence need to be alone anyway, because the hormones can often cause them to fight with others on their territory, and she could very easily start to fight with another bunny as she matures and that would then leave you with more individual buns.
Your best bet is to have them all in places where they can see each other, but not get to each other. This worked well for mine, although there were some spray wars (yes, from boys and girls) but it did mean they could see other buns and so weren't completely isolated from their own species.
I hated the transition time where I was working through getting mine systematically spayed and neutered and having them living apart and stuff, but it was worth it. I still have some stubborn singles, but I have been able to do more bonds than before they were fixed, so that time apart was worth it in the long run.