The only problem I've had with females fighting is my spayed girls and it's usually over who is going to sleep next to me.
I've had girls come into Season together and keep them together, although seperated from everyone else. Never, never have I had them fight with one another, on the contrary they become very considerate of one another and gravitate towards each other.
Unfortunately, aggression at times can be genetic, at other times it is brought on by fear. But, in this situation it appears more to be a genetic disposition. If you choose to keep both the girls, keep them seperated. The pregnant girl should be kept in a quiet area of the home, nothing should be upsetting her. But, if it were me, I would be spaying both of them, just based on their aggressive tendancies.
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