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What you are describing is actually a fairly common result of overcrowding stress, it's a hormonal imbalance that causes females to act that way, but the underlying cause is usually high stress levels. Once a female is sexually mature she wants a certain amount of turf that's all her own as a potential nest site. If she doesn't have that her aggression levels will rise and she will often take on male behavior patterns. Removing the other girl means less competition for nesting sites but won't totally remove the stress as the male will still assert his dominance over her so she can't lay claim to any turf of her own.
The aggressive girls will often "feminize" once caged alone so that they can feel secure in their own territory.
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