chinchillas doomed to not getting along?

We recently got another chinchilla, ChiChi, who's over a year old. When we first got her, we put her in a cage with our other chinchilla, Frida, who's about 9 months old. (which, yes, was a big mistake on my part. I researched enough about chinchillas when they're independent, but not how to introduce them.) Frida was mounting ChiChi at first, and I can't remember what exactly ChiChi did afterwards, but it really scared Frida and she was standing still in the corner of her cage. We kept them separated after that. The next day, we let them both out to play, but they started fighting and fur was lost. We kept their cages next to each other for the next week. Then when we got a new cage, we put them together because it was neutral territory. that didn't work out either. Again, fur was lost. Now we've switched their cages in hopes that they get used to each other's scent. I really hope they aren't incompatible, but I feel like this could be because they got off to a rough start. What do you guys think? Should we not try to put them together again? Or should we possibly wait longer to see if they could possibly still get along?