Look, it sounds like Bella needs a patient owner that will at least give her a chance to acclimate to a new home by doing a by-the-book saferoom and introduction protocol. Which means just not throwing her into a ring with the resident cats and hitting the ring bell, holding up a round card, and watching them fight.
If you are not such an owner, and unwilling to do that, then take her back to the breeder now. It either needs to be a 100% committment, or taking her back now, imo. She doesn't need a temporary "trial" home, another bad experience, and another rehoming. I will say though that you already have a multi-cat household, and even with your two cats that are getting along marvelously, you are very likely to go through this, or worse, with the two of them eventually. So you are going to have to learn to deal with it better than you are now.
Will she "come around"? A lot of that depends on you. The more times they fight, the more times they hiss and growl at one another, or swipe at one another and such, the more they are re-inforcing their unhappiness with each other, and the harder it is going to be. There are techniques for introducing cats and helping them get along. I think 90%+ of the time, with enough patience and commitment, you can help them to at least co-exist peacefully, with perhaps a much better outcome then that. But giving your new cat a sarcastic, unflattering name is a really bad start imo. I see that as really telling in terms of your commitment or lack thereof.
Why is she behaving like she is? Because she probably had a really bad experience with the previous idiot who took her in, and now she is scared, and stressed out. Cats like to own things. They like to own warm, soft spots to sleep, litterboxes and food and water dishes, high perches, and humans who treat them well, give them comfort and food, treats, and play. And they love routine. Waking up at the same time in the same place, eating the same food, seeing the same people etc. And they don't like other cats to "share" in what is theirs. Cats rely very heavily on scent, so ownership and scent go hand-in-hand. If a cat goes into a new home with none of their own scent anywhere, and other cats scent everywhere, that can be a very stressful situation, especially when the other cats and their scent is "in their face" the whole time. That is why when introducing a new cat you need to give the new cats her own room, let her "own it", let her get her scent on everything without other cats intruding, and then when she's become comfortable, plan some careful introductions.
Sorry if I sound harsh. I just hate hearing about cats that are "jerked around" the way she has been. She needs a stable situation, with a devoted owner.
_________________ The little monsters 3
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