Honestly, I would really suggest you try to get them both fixed. I know it can be very expensive so it stinks buuut them both being females their is a much higher chance they will get cancer if they remain unfixed, which will be much more expensive in the long run.
Also, unspayed females are usually much more cage territorial then spayed females, or males. That could be what's going on with your girls - the dominate female is fighting the other one over territory. They probably won't sort it out themselves anytime soon and I wouldn't keep them together if they're fighting because they could really hurt each other if they get into a bad fight.
So I guess at this point, if there is no way you can get them spayed then I would just keep them in seperate cages. If you do get them fixed, then you can try to rebond them later on.
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