I also have experience with fighting rodents...
I know how you feel, I had a pair of guinea pigs that fought all the time, so I seperated them and they would chirp to each other from their cages---so that's as close as they were going to get. I also had a gerbil that would attack my guinea pigs. I have a pet rat and we were going to get him a playmate, but after we saw his reaction to my friend's hamster we changed our mind. As far as I know, females usually get along, but I guess the older female was just have some territorial issues. I agree with everyone else, you need to seperate them. Maybe sometimes you can let them out together on your bed so they can see each other (COMPLETELY supervised). My rat got along really well with my guinea pig, he really liked snuggling up along side his furry body (he also does this with my mom's fiancee's sheltie). I hope this helps and good luck!
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