Any time that you have two females together, you will get some arguments. They will, among themselves, finally decide who is the dominant one and the other will fall in line. It takes a while for this to happen.
If you have not yet had them spayed, I suggest that you do so right away. This will help to calm them down. Women are called bitches for a reason. There is nothing as hormonal as a bitch in heat. They are very close to their first heat cycle so you want to do this soon.
You have done the right thing by putting them in separate crates.
You can help with the dominance issues by deferring to their judgement. Be sure to feed the "alpha" first and pet that one first and let that one have your favors. The other will notice and it will help to ease some of the confusion.
Let me know if you have more questions.
