My bitches are fighting what should I do? -

My name is Marta and my dogs Xispa and Lola, I am having problems of aggression between them two, I'm going to try to give you the maximum information I have. Xispa I got it from puppy, has always been very good and very obedient, is really smart and learns everything quickly, right now is 3 years old and is breed Jack Russell, weighs 5 kg Lola picked up in adoption, after a year of having to xispa, came to me with the trauma of an abandoned dog, very nervous, do not know how to play, or follow orders or go with a belt, it is a mix of Jack Russell with a vintner has 2 and a half years old and weighs 8 kg Adapted well, the coexistence between them was good, Lola was gradually learning the rules of the house, played together, everything normal between them. Time passed, and I saw that they were fighting for the bones, attacking is always Xispa, Lola to see that the rods were put in position, submissive, drew his attention and ended the fight, were punished in their respective cots.as I saw that the problem was the bones stop buy bones... And the truth q since then have had 2 fights more. For work reasons, I had to change housing and as the work is in a boat, of course I can not bring them with me, has taken care of my mother, 6 months will make up to 2 days I've come home. And xispa not to attack Lola but this no longer is thrown back and strikes do not listen to the order of "enough". In 2 days we have fought like 7 times and are going to kill the drooling and all... Then, if the sack walk together and play great but when re-entering the house again... I Know how to act in these cases for q and the thing does not go over... Tomorrow I have time at the vet but I would like to know some guidelines...