Yesterday I spoke with a veterinarian about the problem of aggression among females that were previously well together and he said that it is due to both were in heat recently, something related to hormones that affect their behavior. He recommended the use valerian to reduce anxiety.
Katelin as you posted; he also said that we should rehome the agressive one. Something we don't want to do as one gets very found with these little monsters. We started with one and now have five. But if this what it takes to solve the problem.