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I hate to say this but it is likely the RIR will have to be culled. I had to do that to a white rock that mangled one of my golden comets who spent two weeks in hospital only to be hit upon again by the white rock. Once they think they can make a regular snack of their sisters it is likely to only escalate.
If you try putting them back together make certain that the Leghorn isn't showing any red in that area, blue kote it,hot pick it, and keep a close eye on the situation.
I was more angry at that white rock than I was at the dog who ran our chickens around, two of the jersey giants and one of the white rocks lost most of their tail feathers, and a bit of skin. It took 6 hours to fix the damage to their pen and to round up the girls.