Coming from someone with 24 or 25 (can't keep count ) they will adjust with time. Some adjust immediately and others take some time. It took our Gabby almost a year to adjust. We were just considering finding her a home when all of a sudden she accepted her situation. It was like she knew what we were thinking. I agree with Jen, if you have the time to work with her it can work out. Look at Leila, we just brought her in a few weeks ago and it is working. We have never segregated any of our cats with introduction and for some reason we've been very lucky. Leila holds her own and there are a few spats, but all in all it's working. Good luck with your decision and I hope it works for Sabby whatever the decision.