That's a tough one. People often assume it is the males that are most aggresssive with each other when actually it is the females you have to watch out for. Considering blood is already being drawn, It is going to be a very dangerous situation. You definitely need professional help and then there are no guarantees.
Since you got the 4 year old female after the 7 year old and it is younger and probably easier to place, why don't you try to find that one a good home.
Caretaker of 2 dobermans,, 1 schnauzer, 5 cats, 3 goats, 1 parrot, 1 bearded dragon lizard, 11 chinchillas.
Rest in peace, Cricket, Casey, Bella, Yank, Chloe and Bones.