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  I believe they should be allowed to work things out - to a point.  That does NOT involve blood.  You are going to have to step in an protect your older girl.
 Keep them separated until you can figure this out.
 
 Perhaps a trainer could make a visit to your home?
 
 I have only a male/female combo but have heard that two females can really get nasty to one another.  I'm hoping someone with experience with multiple females will chime in.
 
 I agree with Perella, your youngest sounds like the dominant one; however YOU should be the alpha and that kind of fighting cannot be tolerated.
 
				__________________  Mommy to Lucy, Ringo, and Matthew  |